SMT Recap

by ryanbear, Apr 23, 2026, 5:06 PM

I didn't do any of the activities because my parents didn't want me to miss school
I arrived at around 11 PM and then slept

Power round:
Our team managed to finish the entire section 1 and some parts of section 2
I completely understood the concepts in section 1, which I was happy about
This power round felt way easier than the ones our team did during practice, but it still felt more like reading comprehension than math

Team round:
In the last few minutes, I managed to solve P11 for the team
I really liked that problem since it seems very simple, and has a very nice solution that manages to connect expected value with factorials through p-adic values

Alg:
I solved 1-7 at a normal pace and ran out of time to do the later problems

Discrete:
Same as alg, but I solved 1-6
I really liked p6 because I used algebra, number theory, and combinatorics knowledge to solve it, and the problem statement felt very natural

Guts:
I found the problems really bashy and I was too tired to contribute that much
We managed to get a problem wrong on the first set

Tiebreak:
The alg tiebreak was an estimation problem
The problem had an f^10(x), but I forgot the 10 was a thing and I got 111, when the answer was ~16
I think using one estimaton to determine who gets top 10 is a bad idea and they should have just used a normal tiebreaker test

Other comments:
I really liked the weather, and the region felt normal (during hmmt, there was a bunch of snow, and it felt like a completely new place)
Also, the SMT problems were way more fun than HMMT, since they were actually doable
For me, this was a really good math performance, since I solved some really hard/nice problems and contributed to my team a lot
I managed to get DHM for alg and HM for geo, and I think I got the highest indiv scores on my team
I was on a B team, and the A team did really good (top 5 overall and top 1 indiv)

I also did do any prep for SMT besides the team practices and I still did good
Overall, this year, I stopped preparing for math contests, and I have been getting better results, while other people I know have thrown (eg. AIME, SMT)
This post has been edited 1 time. Last edited by ryanbear, Apr 23, 2026, 5:49 PM

attempt to categorize all the subjects I've once learned

by ryanbear, Mar 25, 2026, 10:58 PM

note: these are just my views on the subjects based on what I was taught, and most of them are probably very inaccurate to what the subjects actually are
this probably makes no sense to most people

understand the world you consciously interact with: human geography, physics mechanics, philosophy, psychology
understand the "behind the scenes" of the world: chemistry, government, biology, physics electricity and magnetism
learning about the "fundamental" aspects of the world: school math, grammar
learning about new worlds: ap chinese, ap computer science, competition math, reading comprehension (I'm the most uncertain about this category*)
creating things: engineering, art in general
analyzing things: language arts, music theory
history: history in general
memorization spam: cursive writing, astronomy, trivia

*you take one thing, solve it, and then move on to another thing that has no relation to the previous thing
this mainly focuses on methods to solve problems instead of knowledge of the world

I might have invented a new keyboard spam

by ryanbear, Mar 18, 2026, 2:38 PM

qgde3rty8uiojh9014w57f2s6a
Type the alphabet on a QWERTY keyboard, but instead of typing the normal letter, type the letter right above the normal letter on the keyboard
When I googled this I couldn't find any results for some reason
This seems kind of simple for nobody to have thought of this before, since lots of people have done the right shift version

update:

qgdecrtykuiojhlpzvwbmfxsna
do the same thing, but warp around

ztecdvbnkmiouylpafxgjrswhq
do the same thing, but go down and warp around
This post has been edited 1 time. Last edited by ryanbear, Apr 29, 2026, 11:30 PM

attempt at making sense of the curvature formula

by ryanbear, Mar 12, 2026, 8:16 PM

I had no idea where the $|r'|^3$ cane from from the curvature formula and why there is a cross product, so I tried to make sense of it
This is not a proof (it's basically a fakeproof where it sort of makes sense why the formula would be true)

From physics class, get that $a_c=\frac{v^2}{R}$.
But note that this only applies when acceleration is perpendicular to the direction
If it's not perpendicular, then note that the circle will be bigger, since only part of the acceleration is pointing towards the center. The rest of the acceleration is pointing upwards, which makes velocity even factor and expands the circle even more.
https://cdn.artofproblemsolving.com/attachments/6/0/244dfb22267c66f98656faba2249de01168918.png

Let $\theta$ be the angle between $v$ and $a$ (the two black arrows)
Then, the horizontal acceleration (red arrow pointing left) is $a \sin \theta$ by definition of sin
So $a_c=a \sin \theta=\frac{v^2}{R}$ and $\frac{a \sin \theta}{v^2}=\frac{1}{R}$
Note that if the radius of the circle is bigger, it is less curvy
https://cdn.artofproblemsolving.com/attachments/9/6/1c00f773a4f22166860ad4d214605d5aeaf765.png

So define $\kappa=\frac{1}{R}$, where $\kappa$ is curvature.
Then, $\kappa=\frac{a \sin \theta}{v^2}=\frac{va \sin \theta}{v^3}=\frac{v \times a}{v^3}=\frac{|r' \times r''|}{|r'|^3}$

replit in 2026 sus

by ryanbear, Feb 22, 2026, 11:58 PM

the replit website has apparantly turned into an ai coding website, in addition to the limit of only 10 free apps
also i can't run any project or access the source code without being signed in

also, the urls on replit are now cursed
instead of just [username].repl.co/[projectname] its now like ec276bd4-93cf-40ee-82bc-64449fd419b8-00-3nktydz7vadhh.worf.replit.dev/

also replit websites can't live forever now and need to be running to be able to be accessed which i think used to not be a thing

for reference i mainly used replit in 2022/23 to create random html websites

hmmt recap

by ryanbear, Feb 16, 2026, 8:06 PM

team round:
i didn't rlly do much (just solved p1 and helped a little with p3)

alg:
i was very locked out for most of the contest
p1 had a 67 reference in it
i tried doing p1 for the first 20 minutes but i couldn't think of anything once i got a cubic
then i skipped and solved p2
i couldn't think of how to solve anything else for the next ~30 minutes
but then i managed to lock in and realized how to do p3 (i was considering the numbers bigger than 6, but i was supposed to consider the numbers smaller than 6 instead)
then i saw the nice solution to solve p1
i ended up getting p2 wrong because i forgot the _2026_ case

distrib: 1010000000 -> 2
i liked p1 because the idea of using vietas was very nice, and this is one of the few problems were the vietas did not feel forced
this is like the 3rd time this year ive clutched a contest at the very end (0 -> 2) (this also happened in amc12a and amc12b)

geo:
i actually locked in for this contest
coordbashed p2 and algbashed p3 (fake geo)
for the p3 my scratch paper had smth like 14=4a-3b and i lost the game
p4 was really nice because i liked the auxillary circle
this was the first time i used an auxillary circle in contest
but then after i got 30-60-90 i thought that leg*sqrt(3)/2=hypotenuse and got it wrong
i realized my mistake while i was holding my answer sheet in the air

distrib: 1110000000 -> 3

combo:
i really liked how all the problems felt natural
i solved p1,p2,p4 and had no idea how to do p3
one of the problems i was doing involved a calculation with 1/4 * 3/4 in it and i lost the game

i also blind guessed p5 because i guessed 252 for every alg/combo problem i couldn't solve, and i managed to guess one right

distrib: 1101100000 -> 4

guts:
i managed to actually contribute to the team this time
one of the problems had a 67 and a 69 in it which was sus

overall:
brainrot references
67: 3 (including one in the estimation)
69: 1
1434: 2

aime commentary

by ryanbear, Feb 7, 2026, 9:57 AM

im gonna give comments on each problem i solved or tried to solve
1. stolen
2. actually good, the problem feels very natural and the solution is also natural. I like how it turns into stars and bars, and then you use that to get powers of 2, and then you use geometric sequence, which combines lots of unrelated math stuff in a nice way
3. too easy, its just visualization
4. sfft is way too obvious. I've also done a similar problem before
5. the rotation part feels kind of meaningless, since after you draw the diagram you just realize its paralel and the rotation doesn't matter (you don't use any rotation properties). Also, this is just the most direct form of law of cosines
6. good problem, I like how you turn $26^{20}$ into $x^{20 \frac{\log 26}{\log x}}$, since that is usually used in calculus problems, but this time it is used in alg, which is nice. The answer extraction is kind of cheesable though.
7. decent problem, i like the concept of cycles in the graph, and the casework didn't feel too bad, since each case was just one calculation
8. really good problem, the numbers make the problem extremely nice, while also making it seem natural, and the solution requires very little calculation
9. really good problem, the concept of placing stickers on dice is really nice, and i really like the idea of covering the stickers with other numbers
10. coordbashable, banned
11. even though i couldn't solve it, making progress on it was kind of fun, since i was discovering new strats to maximize the sum
12. i really like the idea of finding the intersection of the 2 planes using 3d similar triangles, and then using 3d similar triangles again to find the radius, but reflecting the centroid over the hypotenuse makes the problem worse since it is too much calculation (i accidentally reflected over the midpoint of the hypotenuse in-contest)

distrib: 111111111000000 -> 9
i like this score since i didn't do any aime prep because i'm guranteed non-amo qual, so i wasn't expecting that much
i also caught 3 sillies while checking my work (p1 extracted the wrong value, p4 forgot 101, p7 forgot to divide by 2 in the 3,3 case)

i feel like this aime was relatively high quality and i had lots of fun during the contest solving the problems
also, also over all 4 aimes i've taken, ive only gotten 2 distinct scores (6 -> 6 -> 9 -> 9)

color wheel sus

by ryanbear, Jan 28, 2026, 3:45 PM

when you take an image of a color wheel and invert the colors, half of them turn blue
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All uses of the letter I (both upper and lowercase)

by ryanbear, Jan 10, 2026, 5:34 PM

The pronoun I
Inertia
Electric current
Incenter
Set of Imaginary numbers
One in Roman numerals
Identity matrix

imaginary constant
unit vector for the x axis
default for-loop variable

$I$ think that $I=1=[\begin{matrix} 1 & 0 \\  0 & 1\end{matrix}]=MR^2=\frac{V}{R}$ and $i=\sqrt{-1}=<1,0,0>$

2025 recap

by ryanbear, Dec 31, 2025, 1:31 PM

In my math life, basically nothing happened in 2025 compared to the previous years (besides quitting mathdash), so the list of events is really short

Rating: 10/10

Recap

Goals for 2026

9 dimensions on computers

by ryanbear, Aug 17, 2025, 4:14 PM

explanation
https://cdn.artofproblemsolving.com/attachments/8/d/7bb35020530754dc65ec59c71f46ccae2042a3.png
https://cdn.artofproblemsolving.com/attachments/e/9/4727b412b9c3d7cc88a6db833a4c4d5ca02267.png
https://cdn.artofproblemsolving.com/attachments/e/9/6d7e36f4af7ab244078f7ba631acec592433bb.png

random post about dimensions

by ryanbear, Jul 6, 2025, 11:54 PM

the jump from 2D to 3D feels very mid compared to the previous dimension changes

0D: only 1 possible thing can exist
1D: infinite possible things exist, but there is only 1 possible shape (the line)
2D: infinite possible shapes
3D: exact same as 2D, nothing new
from 0D to 1D to 2D, something really groundbreaking is introduced (infinite possible things/shapes), but from 2D to 3D it feels the same

also moving up a dimension also is a massive life improvement for small dimensions, but for big one it is less
(this is from the POV of an nth dimensional being living in the nth dimension with only the sense of sight)

0D: can do nothing
1D: can move back and forth, but is basically blind (eyesight is only a point), nothing interesting to do besides move
2D: can move freely, can do a bunch of new things like build stuff and form a society, infinite variety instead of just the line, life becomes actually interesting to live
3D: basically same as 2D but with one more way to move
also 2D and 3D games are both popular while barely anyone plays 1D games which shows that the increased movement from 2D to 3D isn't that big

i think 1D to 2D is the most important dimension change, followed by 0D to 1D, and then 2D to 3D
this prob makes no sense

Turning scientific models into countries

by ryanbear, Jun 3, 2025, 11:01 PM

Atoms: There is a central hub of various different cities (protons, neutrons), and then over vast distances, there are small nomadic tribes (electrons) that can move around a lot. These tribes rely on the protons to ensure stability, while the neutrons prevent the protons from fighting each other by creating a buffer region. There needs a certain number of electrons to use all the avaliable land. Otherwise, electrons from other atoms will immigrate into the atom to use this extra space (ionic bonds). Inside the cities, there are people of power (quarks) that determine if the city is a proton or neuron.

Cells: There are various sectors of the economy (cell parts) that each contribute a distinct aspect to the economy (cell's life), such as the chloroplasts, who focus on resource extraction (photosynthesis), the mitochondria, who focus on industry (energy production), and the ribosomes, who focus on trade (protein information transfer). The people (proteins) are the most fundamental aspect to keeping the cell alive.

Stars: The people in the nation first start by using simple technology, such as human power, (hydrogen to helium) for most of the time. Suddenly, the people rapidly advance in technology and adopt fossil fuels (turning helium into all the other elements). If this advancement is fast, the urban areas can become too overcrowded, so the population will disperse to far away areas, which could lead to its collapse (supernova). Another outcome is if the government forces everyone to move to the urban areas to increase productivity, leading to an extremely dense population (black hole). Another outcome is if the country runs out of fossil fuels (white dwarf).

Galaxies: The country likely has an irregular shape (irregular galaxies) due to war (interactions) with other countries (galaxies). The monarch (supermassive black hole in the center) has very little power. The country is organized into lots of city-states that can govern themselves (solar systems). National unity is achieved through a common sense of ethnicity and culture (dark matter).

Merge Sort Algorithm: For the manufacturing sector of the country, companies order their workers to manufacture different parts of the product, which is known as interchangeable parts (divide). These individuals use premanufactured pieces and merge them to form their specific part (merge). Then, other workers from the company take all those pieces and merge them together to form the final product (merge).

dumb things I used to believe

by ryanbear, May 27, 2025, 9:45 PM

these are all really recent (like i believed most of these during late middle school and maybe high school)
note: i often knew two pieces of contradicting information but never put them together

there was no industry before the industrial revolution
pink is a color on the rainbow (below purple)
arabic numerals are part of the english language
the main issue of democrats vs republicans is that democrats want a popular vote, while republicans support the electoral college
fibonacci was born in ancient greece
the US and the Soviets raced to build the first nuke
communism and democracy are opposites
nationalism and the scientific method started with ancient civilizations
marx lived in the soviet union
the us still sends people to the moon

AP class experience tier list

by ryanbear, May 16, 2025, 12:18 AM

ranked by overall learning experience, minus the projects specific to the class

S: AP Physics C, AP World
A: APHUG
B:
C: APCSA
D: AP Calc
F: APCSP

AP Physics C: i really liked how i could see all the physics irl, like how i could find the spring constant of the pen by making it jump
this is also the most creative ap class i have taken so far because there's more than just memorizing random stuff
also i really liked how i was struggling at first in the forces unit, but then i suddenly understood everything when doing practice problems, which has never happened before

AP World: its extremely cool how everything is connected, like how napoleon caused the rise of nationalism and the latin american revolutions
this is one of the few non-stem classes ive taken that builds off itself
its also very cool in the 1200-1450 time period to see what the world was like before Europeans took it over

APHUG: it was very cool leaning about how the world was organized, like the city models
but i couldn't see most of this knowledge irl, like all of the rural unit
the politics part with stuff like nation states and conflicts between nations was good because it appears on the news and is talked about a lot, while places like rural areas are kind of insignificant

APCSA: its way too easy, but the curriculum is very standard and easy to follow
its very strange how "Scanner" and "import java.util" aren't tested at all in the ap exam

AP Calc: the homework was just the same problem repeated 50 times
i really dislike the rotation unit because it just has 3 extremely specific problems
the actual concepts are cool tho, like treating dy/dx as a fraction and taking derivative in the middle of an equation

APCSP: this class is extremely random and it is way too broad
like the curriculum goes from reading pseudocode to knowing how the internet works to converting from binary to decimal
this is also harder than APSCA and has no relation to it

half derivative of x^2

by ryanbear, Apr 18, 2025, 8:10 AM

$\frac{d^\frac{1}{2}}{dx^\frac{1}{2}} x^2 = ?$

Let $g(k)$ be the constant after taking the half derivative of $x^k$
Note that the second derivative is in the form of $g(k)x^{k-0.5}$. Taking the second derivative again gives $g(k)g(k-0.5)x^{k-1}=kx^{k-1}$
So $g(k)g(k-0.5)=k$

$g(k)g(k-0.5)g(k-1)g(k-1.5)=k(k-1)$
$g(k)g(k-1.5)=\frac{k(k-1)}{k-0.5}$

$g(k)g(k-1.5)g(k-3)g(k-4.5)=\frac{k(k-1)(k-3)(k-4)}{(k-0.5)(k-3.5)}$
$g(k)g(k-4.5)=\frac{k(k-1)(k-3)(k-4)(k-2)}{(k-0.5)(k-3.5)(k-1.5)(k-2.5)}$

Use induction to get that $g(k)g(k-N.5)=\frac{k(k-1)\cdots(k-N)}{(k-0.5)(k-1.5)\cdots(k-(N-1).5)}=\frac{\frac{k!}{(k-N-1)!}}{\frac{(k-0.5)!}{(k-N.5)!}}=\frac{k!(k-N-\frac{1}{2})!}{(k-0.5)!(k-N-1)!}$

Substitute $k=N.5$
$g(N.5)g(0)=\frac{(N+0.5)! 0!}{N!(-0.5)!}$
$g(0)=\frac{(N+0.5)!}{N!(-0.5)!g(N.5)}$
$g(0)(-0.5)!=\frac{(N+0.5)!}{N!g(N.5)}$
Note that this is constant

So $\frac{(N+0.5)!}{N!g(N.5)}=\frac{(N+1)!}{(N+0.5)!g(N+1)}$
$\frac{g(N+1)}{g(N+0.5)}=\frac{(N+1)!N!}{(N+0.5)!^2}$
Also, note that $g(N+1)g(N+0.5)=N+1$
Substitute $g(N+1)=\frac{N+1}{g(N+0.5)}$ to get that $g(N)=\frac{N!}{(N-0.5)!}$
$g(2)=\frac{2!}{1.5!}=\frac{8}{3\sqrt{\pi}}$
So the answer is $\frac{8x^{1.5}}{3\sqrt{\pi}}$

value of 0.5!

by ryanbear, Apr 17, 2025, 4:52 PM

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how to solve cubic

by ryanbear, Apr 2, 2025, 1:18 PM

1. divide everything by $(x^3 term)$
2. substitute $a=x+\frac{(x^2 term)}{3}$
$\text{         }$ - should get $a^3+[]a+[]=0$
3. substitute $a=\sqrt{\frac{-(a term)}{3}}(\sqrt[3]{k}+\sqrt[3]{\frac{1}{k}})$
$\text{         }$ - should get $[]k+[]\frac{1}{k}+[]=0$
4. solve for $k$ through quadratic formula, then get $a$ and then get $x$ (2 solutions)
5. use vietas to find the last root
This post has been edited 1 time. Last edited by ryanbear, Apr 3, 2025, 4:58 PM

the date is a perfect square

by ryanbear, Mar 22, 2025, 7:55 AM

1795^2=3222025

Nested sine functions inequality

by ryanbear, Mar 17, 2025, 10:10 PM

Quote:
Estimate the minimum number of $\sin$'s such that $\sin \sin \sin \cdots \sin \frac{\pi}{2} < \frac{1}{1000}$
Let $f(x)=\sin \sin \sin \cdots \sin \frac{\pi}{2}$, where $\sin$ is repeated $x$ times
Note that $f'(x) \approx \frac{f(x+1)-f(x)}{1}=f(x+1)-f(x)=\sin(f(x))-f(x)$
Let $y=f(x)$
$\frac{dy}{dx} = \sin(y)-y \approx (y-\frac{y^3}{6})-y=-\frac{y^3}{6}$, since the taylor series of $\sin y$ is $y-\frac{y^3}{6}+\cdots$
$\frac{dy}{\frac{-y^3}{6}} = 1 dx$
$\frac{-6}{y^3} dy = 1 dx$
$\int \frac{-6}{y^3} dy = \int 1 dx$
$\frac{3}{y^2}=x$
$y=\sqrt{\frac{3}{x}}$
When $y=\frac{1}{1000}$, get that $x \approx \boxed{3000000}$

geometric proof of integral of x^2

by ryanbear, Feb 26, 2025, 4:10 PM

Put a $0 \times 0 \times \epsilon$ rectangular prism on the ground
Put a $\epsilon \times \epsilon \times \epsilon$ rectangular prism right above the previous one
Put a $2\epsilon \times 2\epsilon \times \epsilon$ rectangular prism right above the previous one
repeat this process until placing a $1 \times 1 \times \epsilon$ rectangular prism

Note that this forms an upside down right iscosceles square pyramid with side length $1$. The area of this is $\frac{1}{3}$. This can be proven by combining $3$ of them to form a $1 \times 1 \times 1$ cube.
The area of this is also $\epsilon(0^2+\epsilon^2+(2\epsilon)^2+\cdots+1^2)=\int_{0}^1 x^2 dx$
So $\boxed{\int_{0}^1 x^2 dx=\frac{1}{3}}$

how have i never seen this before (i just randomly thought of it)

how to always lose (or tie) tic tac toe as X

by ryanbear, Feb 24, 2025, 6:21 PM

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maa game losses

by ryanbear, Feb 7, 2025, 8:08 AM

2024 aime: my scratch paper had 14*34
2025 amc8: the answer to p14 is 34
2025 aime: the answer is (1+sqrt(1+4*34^2))/68 which has a 1434 in it

2024 recap

by ryanbear, Dec 30, 2024, 9:50 PM

important changes:
stopped grinding ftw
started mathdash
stopped being active on aops and ommc
started wamo
started problemwriting more
started otis
forgot which subjects i mained

recap

Ratings:
3/10 for 9th grade part
8/10 for summer
10/10 for 10th grade part

only failed 1 comp this entire year and it was at the beginning
no new qualifications tho

ISL solve after 2 years

by ryanbear, Dec 27, 2024, 12:19 PM

i tried solving this problem in 8th grade and 9th grade and failed both times
Quote:
Let $n \ge 1$ be an integer,
and let $A$ be a subset of $\{0,1,2,\dots,5^n\}$.
If $|A|=4n+2$, prove that there exist $a,b,c \in A$
such that $a < b < c$ and $c+2a > 3b$.

Use proof by contradiction. Assume that there is a subset $A$ such that $c+2a \le 3b$ is always true. Note that $b \ge \frac{c+2a}{3}$. Let the subset be $X$, where $X$ is in increasing order. Let $X_0=a$ and $X_{4n+2}=c$. Note that $X_1 \ge \frac{c+2a}{3}$. Note that $X_2 \ge \frac{c+2X_1}{3} \ge \frac{c+2 \cdot \frac{c+2a}{3}}{3} = \frac{5c+4a}{9}$.
Claim that $X_q \ge \frac{2^q  a + (3^q-2^q)  c}{3^q}$. This can be proven by induction.
Base case: $q=1$ works.
Induction: Assume that $q$ works. Then, $X_{q+1} \ge \frac{c+2X_q}{3} \ge \frac{c+2 \cdot \frac{2^q  a + (3^q-2^q)  c}{3^q}}{3} \ge \frac{2^{q+1} a + (3^{q+1} - 2^{q+1}) c}{3^{q+1}}$, so $q+1$ also works.
As a result, $X_{4n+1} \ge \frac{2^{4n+1} a + (3^{4n+1}-2^{4n+1}) c}{3^{4n+1}} = (\frac{2}{3})^{4n+1} a + (1-(\frac{2}{3})^{4n+1}) c = c - (\frac{2}{3})^{4n+1}(c-a) \ge c-\frac{2}{3} (\frac{16}{81})^{n} 5^n = c-\frac{2}{3}(\frac{80}{81})^n > c-1$. Because $X$ is a series of integers, $X_{4n+1}=c$, but $X_{4n+2}=c$, so this is a contradiction. As a result, there has to be $a,b,c$ such that $a<b<c$ and $c+2a>3b$.

extremely big number i made

by ryanbear, Dec 22, 2024, 6:53 PM

note: when a coefficient becomes 0, it gets deleted, and everything to the right of it gets shifted

$f(a_1,a_2)=a_1+a_2$
$f(a_1,a_2,\cdots,a_n)=f(a_1,a_2,\cdots,a_{n-2},f(a_1,a_2,\cdots,f(a_1,a_2,\cdots,f(\cdots),a_{n-2}-1,a_{n-1},a_n), a_{n-1}-1,a_n),a_n-1)$
n=3 case

Let $F(n)=f(n,n,\cdots,n)$, where $n$ is repeated $n$ times
Take $F(10^{100})$
This post has been edited 1 time. Last edited by ryanbear, Dec 22, 2024, 6:53 PM

Proof that a cube has 6 faces

by ryanbear, Dec 16, 2024, 7:50 PM

Let $r$ be the perpendicular distance from the center of a cube to the edge. Note that the volume of the cube is $V=(2r)^3=8r^3$
Get that $\frac{dV}{dr}=24r^2$. Note that this is the surface area. Note that the area of one face is $A=4r^2$. As a result, the surface area is $24r^2=6A$, so there are six faces.
Using similar logic, get that a hypercube has $8$ faces and that an $n$-dimensional cube has $2n$ faces.

when i tried doing this again i got that a cube has 24 edges which is very sus idk how to fix this

2024-2025 goals (revised)

by ryanbear, Nov 17, 2024, 2:32 PM

finished
less important

In progress and important:
MathDash: get purple classical
purple range got changed to 2400-2600 instead of the old 2200-2400 but i think its more accurate now
peaked at 2350s, but now i have <2200 rating
to do this i should probably start grinding daily decathalons, 1/2 per week
AIME: get around 12
haven't started AIME prep yet
i should do all the AIME minis on mathdash
OTIS: finish elem geo before 2025, finish n-3 to n units by summer
to do this i should try to do at least 1 prob per day, 2 for easier units
USACO: get at least one solve on silver, maybe gold qual if i grind enough
to do this im trying to get around 1 cf solve a day

amc sus­­­

by ryanbear, Nov 5, 2024, 8:39 PM

amc is in 1 day but im not stressed at all for some weird reason
i also have ss test tomorrow but im not stressed

1600 FTW Rating

by ryanbear, Oct 28, 2024, 4:26 PM

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2021 CMC 10A Recap

by ryanbear, Sep 15, 2024, 9:44 PM

score: 127.5
Distrib: 66666 66666 66666 6666B B6BBB

opinion: kind of bashy
fav probs: p22
not fav probs: p13, p19


sus probs

p8: originally, i didn't consider the OEOEOE alternating case bc I assumed that it had to be no 2s or all 2s
how to fix: during a combo problem go from fact (always even/odd) to cases, instead of directly finding the cases

p10: originally, i tried using combinatorics instead of listing out the cases, but there were only 2 cases (i thought there were way more)
how to fix: when i can't solve a <15 combo prob then just casework bash

p13: forgot that squares could end with a 1
how to fix: when a <15 problem is too bashy then rethink
This post has been edited 2 times. Last edited by ryanbear, Sep 15, 2024, 10:08 PM

powerpoint sus

by ryanbear, Sep 8, 2024, 10:03 PM

just realized the powerpoint hexagon is not regular (even with shift click)
Attachments:

replit sus

by ryanbear, Aug 28, 2024, 8:34 PM

can't make any more repls now rip
Attachments:

2022 WMC 10 Recap

by ryanbear, Aug 12, 2024, 9:16 PM

Score: 127.5
Distrib: [16]B666 6BBBB

Opinion: very high quality and very hard, some problems were misplaced
Fav probs: P9, P12
Least fav probs: P4, P20

i went too slow and didn't have time for final five or p17
made lots of mistakes at first but then fixed them
Reading mistakes:
P13: ABC has area 60, not ABD (note: write "60" on top of ABC to remember that)

Arithmetic mistakes:
P16: 14 is not divisible by 3
P20: 1000/3 is not 300

Combo mistakes:
P6: caseworking on position of the HH, forgot to include HTHH (note: just bash it out its just 8 cases)
P14: the a<b=c and a<c=b cases are the same (note: see if there is any overlap between cases)

Other:
P10: didn't see the isoceles case for a long time because focused too much on angles (note: when angles don't work use side info to find isoceles stuff (in general, try differnet approach))
This post has been edited 2 times. Last edited by ryanbear, Aug 12, 2024, 9:44 PM

very sus vietas

by ryanbear, Aug 5, 2024, 10:57 AM

mathman3880 wrote:
Find the remainder when
$$\prod_{i = 1}^{1903} (2^i + 5)$$is divided by $1000$.

sol
This post has been edited 1 time. Last edited by ryanbear, Aug 5, 2024, 10:58 AM

Goals for 2024-2025 school year

by ryanbear, Jul 31, 2024, 4:17 PM

AMC10: get more than 130 or close to it
AIME: get around 12
JMO: qualify and solve some problems
[blank]MT competitions: qualify
MathDash: get purple classical and dark blue proof rating
Problemwriting: write an amc10 mock and some other competitions
USACO: get at least one solve on silver, maybe gold qual if i grind enough
USAMTS: remember to do it
Math1: have fun during math competitions instead of getting stuck on p1 for 10 hours
Math2: don't get problems wrong due to misreading
Math3: solve some 15 mohs problems and maybe a few 20 mohs probs
General: straight As
General2: 5 on APs
General3: get attention span to around an hour
General4: stop spamming xooks rbo and 1434
This post has been edited 1 time. Last edited by ryanbear, Jul 31, 2024, 4:18 PM

I got #1 mathdash in WA

by ryanbear, Jul 30, 2024, 9:38 AM

$               $
Attachments:

i solved a 35 mohs (probably fakesolve)

by ryanbear, Jul 26, 2024, 1:14 PM

LLL2019 wrote:
Turbo the snail plays a game on a board with $2024$ rows and $2023$ columns. There are hidden monsters in $2022$ of the cells. Initially, Turbo does not know where any of the monsters are, but he knows that there is exactly one monster in each row except the first row and the last row, and that each column contains at most one monster.

Turbo makes a series of attempts to go from the first row to the last row. On each attempt, he chooses to start on any cell in the first row, then repeatedly moves to an adjacent cell sharing a common side. (He is allowed to return to a previously visited cell.) If he reaches a cell with a monster, his attempt ends and he is transported back to the first row to start a new attempt. The monsters do not move, and Turbo remembers whether or not each cell he has visited contains a monster. If he reaches any cell in the last row, his attempt ends and the game is over.

Determine the minimum value of $n$ for which Turbo has a strategy that guarantees reaching the last row on the $n$-th attempt or earlier, regardless of the locations of the monsters.

Proposed by Cheuk Hei Chu, Hong Kong

this feels more like a usaco prob than an imo prob

https://cdn.artofproblemsolving.com/attachments/f/c/af563283d17d51221817eb5423cd0d9759a160.png

ISL admits

by ryanbear, Jul 24, 2024, 6:15 PM

MathStudent2002 wrote:
Let $a$ be a positive integer which is not a perfect square, and consider the equation \[k = \frac{x^2-a}{x^2-y^2}.\]Let $A$ be the set of positive integers $k$ for which the equation admits a solution in $\mathbb Z^2$ with $x>\sqrt{a}$, and let $B$ be the set of positive integers for which the equation admits a solution in $\mathbb Z^2$ with $0\leq x<\sqrt{a}$. Show that $A=B$.
This post has been edited 1 time. Last edited by ryanbear, Jul 24, 2024, 6:15 PM

first ISL P3 solve (???)

by ryanbear, Jul 13, 2024, 1:36 PM

MarkBcc168 wrote:
Let $a > 1$ be a positive integer and $d > 1$ be a positive integer coprime to $a$. Let $x_1=1$, and for $k\geq 1$, define
$$x_{k+1} = \begin{cases}
x_k + d &\text{if } a \text{ does not divide } x_k \\
x_k/a & \text{if } a \text{ divides } x_k
\end{cases}$$Find, in terms of $a$ and $d$, the greatest positive integer $n$ for which there exists an index $k$ such that $x_k$ is divisible by $a^n$.


sol

1434 and 1984 in the same problem

by ryanbear, Jun 22, 2024, 9:42 PM

literally 143414341984
Attachments:

i did the globle in 1

by ryanbear, Jun 1, 2024, 2:31 PM

$                                   $
Attachments:

bertrant postulate sus

by ryanbear, May 27, 2024, 10:30 PM

bruh i always thought it was $n<p<2n$ but for $n>3$, it becomes $n<p<2n-2$ (i did not know this)

10000 problems correct in ftw

by ryanbear, Apr 28, 2024, 9:23 PM

1800 mathdash rating

by ryanbear, Apr 22, 2024, 5:17 PM

i just got 1800 rating in mathdash by getting +123 from the target mock
Attachments:

CRT on polynomials

by ryanbear, Apr 12, 2024, 1:48 PM

Quote:
The polynomial $R(x)$ is the remainder upon dividing $x^{2007}$ by $x^2-5x+6$. $R(0)$ can be expressed as $ab(a^c-b^c)$. Find $a+c-b$.
Let $N$ be $R(x)$.
$N=r(x-2)+2^{2007}=q(x-3)+3^{2007}$ by the remainder theorem
Take mod $x-3$
$r+2^{2007}=3^{2007} \pmod {x-3}$
$r=3^{2007}-2^{2007} \pmod {x-3}$
$r=3^{2007}-2^{2007}+c(x-3)$
$N=(3^{2007}-2^{2007}+c(x-3))(x-2)+2^{2007}$
Let $z=3^{2007}-2^{2007}$
$N=(z+cx-3c)(x-2)+2^{2007}=zx+cx^2-3cx-2z-2cx+6c+2^{2007}=c(x^2-5x+6)+zx-2z+2^{2007}$
So the remainder is $zx-2z+2^{2007}$ and when $x=0$ this becomes $-2*3^{2007}+3*2^{2007}+=6(2^{2006}-3^{2006})$, so the answer is $2+2006-3=\boxed{2005}$

rare moment of HSO being off topic

by ryanbear, Apr 11, 2024, 3:11 PM

https://artofproblemsolving.com/community/c6h3295531
this has 1 solution per 23 posts when its normally like 20 solutions per 23 posts
This post has been edited 1 time. Last edited by ryanbear, Apr 11, 2024, 3:12 PM

187 187 187

by ryanbear, Apr 8, 2024, 11:42 PM

my mathdash contest got 187 contestants

I solved a 55 MOHS

by ryanbear, Apr 1, 2024, 7:45 PM

WWWWWWWWWWWWWWW

Induction over the Reals

by ryanbear, Mar 26, 2024, 12:21 PM

Problem: Five points $a_1, a_2, ..., a_5$ are arranged in the coordinate plane so that they form a regular pentagon. Point $a_n$ follows point $a_{n+1}$ and point $a_5$ follows $a_1$. Each point moves at the same speed. Prove that the points always form a regular pentagon.
Proof:
Base case: The points start out as a regular pentagon.
Inductive step: Let $h$ be the distance between two consecutive real numbers *. If the points at time $t$ form a regular polygon, then for the next $h$ moments, the points move across the lines of the pentagon, so it becomes a rotated polygon, so $t+h$ also works, so by induction, all times work.
This post has been edited 1 time. Last edited by ryanbear, Mar 26, 2024, 12:21 PM

new paganini song

by ryanbear, Mar 18, 2024, 7:22 PM

after 185 years a year paganini song finally came out (im a little late)
Attachments:

I beat an 1800 in ftw

by ryanbear, Mar 18, 2024, 3:21 PM

$                       $
Attachments:

otis excerpts sus

by ryanbear, Mar 2, 2024, 7:26 PM

for imo 1998 otis excerpts uses a and b instead of m and n

Happy pi day!

by ryanbear, Mar 1, 2024, 12:47 AM

pi=3.1 trust
also its chopin's birthday

orz song I found

by ryanbear, Feb 28, 2024, 6:34 PM

vocalise no 14 op 34

estimation challenge

by ryanbear, Feb 26, 2024, 8:25 PM

estimate how many times the letter "x" appears in this text
Attachments:

252 252 252

by ryanbear, Feb 25, 2024, 8:34 PM

bruh why do i see 252 everywhere

First 30 MOHS

by ryanbear, Feb 17, 2024, 11:15 PM

jasonhu4 wrote:
Find the minimum possible value of \[\frac{a}{b^3+4}+\frac{b}{c^3+4}+\frac{c}{d^3+4}+\frac{d}{a^3+4}\]given that $a$, $b$, $c$, $d$ are nonnegative real numbers such that $a+b+c+d=4$.

Proposed by Titu Andreescu

Let $f(x)=\frac{1}{x^3+4}$
Let $g(x)=f(x)-(-\frac{x}{12}+\frac{1}{4})$
Then $g'(x)=-\frac{3x^2}{(x^3+4)^2}+\frac{1}{12}=\frac{(x-2)(x^2+2x-2)(x^3+6x+4)}{12(x^3+4)^2}$. The real zeroes of this are $2$ and $-1 \pm \sqrt{3}$. Plugging them in gives that from $-1-\sqrt{3}$ to $-1+\sqrt{3}$, it increases. Then, from $-1+\sqrt{3}$ to $2$ it decreases. Finally, it increases. Because $g(0)=0$, the first increasing section is always nonnegative. Because $g(2)=0$, the first decreasing part is always nonnegative. So the last part would also be nonnegative beacuse it is more than $g(2)=0$. So $g(x) \ge 0$
$f(x) \ge -\frac{x}{12}+\frac{1}{4}$
$af(b)+bf(c)+cf(d)+df(a) \ge -\frac{ab+bc+cd+da}{12}+\frac{a+b+c+d}{4} \ge -\frac{(b+d)(a+c)}{12}+1 \ge -\frac{2*2}{12}+1 \ge \boxed{\frac{2}{3}}$

Comment: way to easy for 30 mohs

prefix sums

by ryanbear, Feb 11, 2024, 8:14 PM

just used prefix sums on a math problem

prob
sol
This post has been edited 2 times. Last edited by ryanbear, Feb 11, 2024, 8:20 PM

sus rbo 1434

by ryanbear, Feb 9, 2024, 4:03 PM

in my precalc quiz at school there was a problem with answer 1434

guess the text based on the first letters of the words

by ryanbear, Feb 8, 2024, 3:36 PM

1
2
3
4
5

failed aime

by ryanbear, Feb 1, 2024, 3:13 PM

2021 DIME (best score on an aime mock)

by ryanbear, Jan 29, 2024, 11:23 PM

Score: 12
Distrib: 11111 11111 11000 (fakesolved 11)
1-8 was easy and I did them in ~1hr
9 took me 30 minutes somehow
then spent the next 30 mins checking my work and fixed 3 sillies (p4, p5, p7)
then spent next 59 minutes on final fives (fakesolved 11 by doing a=1,2,3 then noticing that all evens work)
spent the last minute checking work, fixed 1 silly (p6)
p10 fav problem on test

2022-23 Or(Z)IME Mock

by ryanbear, Jan 28, 2024, 5:08 PM

Score: 10
Distrib: 11111 11110 01000 (no sillies)
I liked the problem quality but it was a little easy
P7 and 8 fav problems on test
Before checking work, in P9 I forgot that 16 was a perfect power and P6 I did PIE wrong

vsc moment

by ryanbear, Jan 26, 2024, 7:24 PM

i was writing pseudocode and vsc detected it as python

msm being msm

by ryanbear, Jan 24, 2024, 7:01 PM

https://ec276bd4-93cf-40ee-82bc-64449fd419b8-00-3nktydz7vadhh.worf.replit.dev/aops_msm.mp4

buddymeter quiz I made

by ryanbear, Jan 10, 2024, 3:51 PM

I beat a 1795 in ftw

by ryanbear, Jan 8, 2024, 9:28 PM

$                   $
Attachments:

silly moment

by ryanbear, Jan 7, 2024, 12:54 PM

the number below 7 is 5

FTW Glitch (10 concurrent games)

by ryanbear, Jan 4, 2024, 12:49 PM

lost 43 ftw rating

by ryanbear, Jan 4, 2024, 12:13 PM

lag + ftw glitch moment (doubbles rating change)

First ISL solve of 2024

by ryanbear, Jan 3, 2024, 1:05 PM

Let $ABC$ be triangle with incenter $I$. A point $P$ in the interior of the triangle satisfies \[\angle PBA+\angle PCA = \angle PBC+\angle PCB.\]Show that $AP \geq AI$, and that equality holds if and only if $P=I$.

$\angle BPC=\angle ABP+\angle ACP+\angle A=\angle CBP+\angle PCB+\angle A=180-\angle BPC+\angle A$
$2\angle BPC=180+\angle A$
$\angle BPC=90+\frac{\angle A}{2}=\angle BIC$
so $BPIC$ is cyclic.
Let $E$ be the point where the line $AI$ intersects the circumcircle of $ABC$
By the incenter excenter lemma, $E$ is the center of the circumcircle of $BIPC$, so $EI=EP$
By the triangle inequality, $AP+PE \ge AE$
$AP+PE \ge AI+EI$
$AP \ge AI$

my la book has 3434

by ryanbear, Jan 2, 2024, 3:51 PM

3434 = you lost the game
Attachments:

happy 2024

by ryanbear, Jan 1, 2024, 12:04 AM

lost the game 2 minutes after 2024 started

2023 recap

by ryanbear, Dec 30, 2023, 12:15 AM

failed 1 amc8, 2 amc10s, and 1 aime
fluked 3 mathcounts (especially school) (went from no chapter 7th to state cdr 8th which was nice)
qualified for something for the first time (aime, chapter, state)
gained 138 ftw rating (gained 168 at peak) (1363 - 1501/1531). Reached 1434 in the process
beat several 1700s in ftw
started oly
became a number theory main
became active in OMMC and did the contest
heard about 1434 (might have been december) and 8729
started using my blog
learned calculus
Rating: 9.3/10

Goals for 2024:
Not fail a math competition
1600 ftw (???)
Qualify for BMT, HMMT, or SMT
DHR on AMC10 (or close)
10+ on AIME
14+ on JMO (???)
Stop visiting MSM and blogroll
Consistently solve 10 or 15 MOHS
Be confident in complex and barry bash
Get >600 on a USACO Silver
Get better at problemwriting
This post has been edited 3 times. Last edited by ryanbear, Jan 3, 2024, 3:36 PM

math moment

by ryanbear, Dec 26, 2023, 8:32 PM

I did the zpordle in 3

by ryanbear, Dec 25, 2023, 9:23 PM

.

1434 i lost the game (69th post)

by ryanbear, Dec 21, 2023, 4:07 PM

i just figured out that the game (1434) existed in 2020 i thought it was made in 2022

https://artofproblemsolving.com/community/c49h2253048p17417932
This post has been edited 2 times. Last edited by ryanbear, Dec 21, 2023, 4:08 PM

6th place in greed control

by ryanbear, Dec 20, 2023, 9:19 PM

codeforces 1434

by ryanbear, Dec 19, 2023, 11:51 PM

$                            $
Attachments:

If I had to rename theorems

by ryanbear, Dec 19, 2023, 12:19 AM

try to guess what these refer to:
root relations theorem
completing the rectangle
packing theorem
sides-diagonals theorem
angle-side theorem
generalized pythag
generalized bh/2
physics geometry
table strat
choose addition
extended choose addition
doubble extended choose addition
degree reduction formula
generalized degree reduction formula
lowering the exponent
factorial factor theorem
exponent distributive property
This post has been edited 1 time. Last edited by ryanbear, Dec 19, 2023, 12:20 AM

rating aops funny numbers

by ryanbear, Dec 16, 2023, 8:56 PM

1434 >>> 665 > 3434 > 187 > 8729

I beat an ftw leaderboarder first try

by ryanbear, Dec 11, 2023, 3:00 PM

highest rated person that i beat in ftw (1784)
Attachments:
This post has been edited 1 time. Last edited by ryanbear, Dec 11, 2023, 8:00 PM

length of a parabola

by ryanbear, Dec 7, 2023, 9:19 AM

Q: Find the length of $x^2$ from $0$ to $1$
A: The formula for the length of an arc is $\int_{a}^{b} \sqrt{1+f'(x)^2}$, so for this case, the answer is $\int_{0}^{1} \sqrt{1+4x^2}$.
Let $x=\frac{\tan{\theta}}{2}$, $dx=\frac{\sec^2 \theta}{2} d\theta$
$\int \sqrt{1+4x^2} dx=\sec{\theta} \frac{\sec^2 \theta}{2}=\frac{\sec^3 \theta}{2}$
$\int \frac{\sec^3 \theta}{2} = \frac{\int \sec^3 \theta}{2}$
Let $u=\sec{\theta}, v = \sec^2{\theta}$.
The derivative of $u$ is $\sec{\theta}\tan{\theta}$. The integral of $v$ is $\int sec^2 \theta = \tan \theta$. So by integration by parts, $\int \sec^3 \theta$ becomes $\sec \theta \tan \theta - \int \sec \theta \tan^2 \theta =$
$\sec \theta \tan \theta - \int \sec \theta (\sec^2 \theta - 1)= \sec \theta \tan \theta - \int \sec^3 \theta + \int \sec \theta$
$\int \sec \theta = \int \frac{1}{\cos \theta}= \int \frac{\cos \theta}{\cos^2 \theta}= \int \frac{\cos \theta}{1-\sin^2 \theta}$
Let $u=\sin \theta$
This becomes $\int \frac{1}{1-u^2} du$
Let $\frac{1}{1-u^2} = \frac{A}{1+u}+\frac{B}{1-u}$
$A+B+u(B-A)=1$
$A+B=1, B-A=0$
$A=B=\frac{1}{2}$
So $\int \frac{1}{1-u^2} du = \int \frac{\frac{1}{2}}{1+u}+\frac{\frac{1}{2}}{1-u} du = \frac{\ln |1+u|}{2} - \frac{\ln |1-u|}{2}$
And $\int \sec \theta = \frac{\ln |1+\sin \theta|}{2} - \frac{\ln |1-\sin \theta|}{2}$
$\int \sec^3 \theta = \sec \theta \tan \theta - \int \sec^3 \theta + \frac{\ln |1+\sin \theta|}{2} - \frac{\ln |1-\sin \theta|}{2}$
$2\int \sec^3 \theta = \sec \theta \tan \theta + \frac{\ln |1+\sin \theta|}{2} - \frac{\ln |1-\sin \theta|}{2}$
$\frac{\int \sec^3 \theta}{2} = \frac{\sec \theta \tan \theta}{4} + \frac{\ln |1+\sin \theta|}{8} - \frac{\ln |1-\sin \theta|}{8}$
$\int \sqrt{1+4x^2} dx=\frac{\sec \theta \tan \theta}{4} + \frac{\ln |1+\sin \theta|}{8} - \frac{\ln |1-\sin \theta|}{8}$
Because $\tan \theta = 2x$, $\sec \theta = \sqrt{4x^2+1}, \sin \theta = \frac{\tan \theta}{\sec \theta} = \frac{2x}{\sqrt{4x^2+1}}$
$\int \sqrt{1+4x^2} dx=\frac{x\sqrt{4x^2+1}}{2} + \frac{\ln |1+\frac{2x}{\sqrt{4x^2+1}}|}{8} - \frac{\ln |1-\frac{2x}{\sqrt{4x^2+1}}|}{8}$
When $x=1$ this becomes $\frac{4\sqrt{5}+\ln (9+4\sqrt{5})}{8}$
When $x=0$ this becomes $0$
So the value of the integral from $0$ to $1$ is $\boxed{\frac{4\sqrt{5}+\ln (9+4\sqrt{5})}{8}}$

I made a song

by ryanbear, Dec 6, 2023, 11:14 PM

click here
(or here for no download)
This post has been edited 2 times. Last edited by ryanbear, Dec 7, 2023, 6:59 PM

guess the math problem

by ryanbear, Dec 6, 2023, 1:04 PM

random diagram i found at the end of my notebook
Attachments:

First ISL Combo Solve

by ryanbear, Nov 30, 2023, 5:50 PM

I might have just did my first ISL combo solve (2002 C1)
This post has been edited 2 times. Last edited by ryanbear, Dec 18, 2023, 11:37 PM

geometry formulas tier list

by ryanbear, Nov 26, 2023, 7:05 PM

S: coordbash, mass points, congruent/similar triangles, angle chasing
A: angle bisector theorem, herons, LOC, sine area formula, power of a point, a=sr
B: incircle tangents lengths are equal, ptoloney, homothety, stewarts, completing the hexagon (?), complete quadrilateral, sin(a+b), cos(a+b)
C: alternate secant, LOS, tan(a+b), transformations besides homothety, sum to product, product to sum
D: power reducing formula.
F: picks, doubling the median

Explanations (makes very little sense)
This post has been edited 1 time. Last edited by ryanbear, Nov 30, 2023, 8:31 PM

ranking prime numbers from 1-20

by ryanbear, Nov 19, 2023, 7:17 PM

13 is the "most prime" number from 1 to 20
then 7
then 19
then 17
then 11
then 3
then 5
then 2
This post has been edited 1 time. Last edited by ryanbear, Nov 19, 2023, 10:32 PM

something interesting I noticed

by ryanbear, Nov 16, 2023, 8:27 AM

ln(2)+log(2) is very close to 1

20000th aops view

by ryanbear, Nov 15, 2023, 9:58 AM

$                             $
Attachments:

sus coincidence

by ryanbear, Nov 12, 2023, 1:29 PM

2022 DMC 10A and 2022 XYZMC 10 have the same answers for the first 5 problems (CDBBB)
This post has been edited 1 time. Last edited by ryanbear, Nov 12, 2023, 1:29 PM

3D geo problem set

by ryanbear, Nov 11, 2023, 7:05 PM

https://amctrivial.com/?problems=2010_AMC_12A_Problems/Problem_7|2016_AIME_I_Problems/Problem_4|2012_AMC_12B_Problems/Problem_19|2021_AIME_I_Problems/Problem_6|2013_AIME_I_Problems/Problem_7|2012_AIME_I_Problems/Problem_8|2011_AIME_I_Problems/Problem_8|2015_AIME_I_Problems/Problem_15

no filters were used besides the 3d geo
This post has been edited 1 time. Last edited by ryanbear, Nov 11, 2023, 7:06 PM

reversing numbers poll

by ryanbear, Nov 10, 2023, 12:05 PM

9Poll:
what # do you get when you reverse 560?
20 Votes
55%
(11)
40%
(8)
5%
(1)
Hide Results Show Results
You must be signed in to vote.
$                                     $
This post has been edited 1 time. Last edited by ryanbear, Nov 10, 2023, 12:05 PM

I glitched FTW

by ryanbear, Nov 9, 2023, 1:25 PM

My computer was lagging a lot so there was a few second delay between me creating the game and the game starting and I used that delay to create another game.
Attachments:

50th entry + discord stuff

by ryanbear, Nov 7, 2023, 10:22 PM

I changed my discord alt's username to "pyramidscheme_40320" and got 7 friend reqs and 2 dms in 2 days xoonks rbo

my amc10 strat

by ryanbear, Nov 7, 2023, 6:49 PM

non instasolve/non coodbash geo = skip
bashy combo = double check
answer is E = double check
after solve 20 probs try the geo problems and check work

goofy answer distrib mock amc10

by ryanbear, Nov 4, 2023, 6:16 PM

i just did a mock amc10 with 3 Ds in a row and 3 Es in a row followed by 3 Cs in a row

2022 WOGMC 10A
https://artofproblemsolving.com/community/c3014868h2778241_wogmc_10a_answer_key
This post has been edited 1 time. Last edited by ryanbear, Nov 4, 2023, 6:35 PM

sillied correctly

by ryanbear, Nov 2, 2023, 9:03 PM

I was doing a mock amc10 and sillied a problem correctly
Quote:
For how many real numbers 0 ≤ x ≤ 10 is x^2 + {x} an integer?
I ignored the curley brackets because I thought that they were parentasies and just did f(10)-f(0)+1=111 (f(x)=x^2+x), which happened to be the correct answer
This post has been edited 2 times. Last edited by ryanbear, Nov 2, 2023, 9:03 PM

calculator for 3*4 moment

by ryanbear, Nov 2, 2023, 9:23 AM

$             $
Attachments:

approximating square roots

by ryanbear, Oct 31, 2023, 3:41 PM

To approximate $\sqrt{a}$, evaluate $f(f(b))$ or $f(f(f(b)))$ for more accuracy, where $f(x)=\frac{a}{2x}+\frac{x}{2}$ and $b$ is a number close to $\sqrt{a}$
This post has been edited 1 time. Last edited by ryanbear, Oct 31, 2023, 3:45 PM

tied with an 1800

by ryanbear, Oct 30, 2023, 5:17 PM

$                      $
Attachments:

screwed for amc10

by ryanbear, Oct 29, 2023, 8:45 PM

my amc10 mock scores for 7 mocks in a row have been nonincreasing

keyboard shortcut I found a while ago

by ryanbear, Oct 28, 2023, 3:57 PM

When you hold control, windows, and alt and press tab, you get a different alt tab screen.
This post has been edited 1 time. Last edited by ryanbear, Oct 28, 2023, 3:57 PM

1000 wins

by ryanbear, Oct 24, 2023, 8:44 AM

$                                  $
Attachments:

connected components

by ryanbear, Oct 23, 2023, 7:12 PM

I always thought that connected components was O(n^2) time complexity but now I learned it was O(v+e)

extremely relatable

by ryanbear, Oct 22, 2023, 11:47 PM

I am able to do problems 1 - 11ish in around 15 minutes, leaving me with 1 hour to do the remaining 14ish problems, but I can only solve around 5 or 6 of these problems before running out of time. I have the potential to solve ~20 of these problems but do not get the time to reach problem 20. How do I go about increasing my speed for problems 11ish - 25?

this is exactly me but replace 5 or 6 with 6-8
This post has been edited 1 time. Last edited by ryanbear, Oct 22, 2023, 11:51 PM

ftw lag moment

by ryanbear, Oct 20, 2023, 3:21 PM

i was playing ftw in school and my computer took 5 seconds to load each problem and 5 second to join a game and half the time ftw would stop working

desmos 3d

by ryanbear, Oct 19, 2023, 5:18 PM

i just realized that desmos 3d existed

first AoPS user I think of that starts with each letter

by ryanbear, Oct 18, 2023, 9:15 PM

don't question
A: aydenlee
B: baffledBear
C: cxrupptedpat
D: duo_duo
E: ethan7sky
F: flower417477
G: greenpenguin2
H: heheman
I: ilovepizza2020
J: jjw4106
K: KA01JK1A
L: lpieleanu
M: mathmax12
N: NT3ishard
O: OronSH
P: purplepenguin2
Q: QIDb602
R: ryanbear
S: sepehr2010
T: thodupunuri
U: ujulee
V: v4913
W: wuwang2002
X: [don't know anyone]
Y: YaoAOPS
Z: zhenghua
#: 1434runescape

a random question

by ryanbear, Oct 14, 2023, 10:01 PM

why do people post math stories for post count specials
shouldn't people post math stories when they get their math goal (like jmo qual) or something

3 same scores in a row

by ryanbear, Oct 13, 2023, 6:52 PM

I got a 123 on 3 mock amc10s in a row. For each of them, I got 19 of them right and blanked 6. For two of them i did 1-19 for one I did 1-20 but didn't do a middle problem.

a=a ­­­­­­­

by ryanbear, Oct 8, 2023, 10:28 PM

When a math problem uses α and a at the same time and they mean different things

Inequality Solve

by ryanbear, Oct 8, 2023, 1:03 PM

Quote:
$a,b,c>0$, $\frac{1}{a}+\frac{1}{b}+\frac{1}{c}=1$
Prove that $(a+1)(b+1)(c+1) \ge 64$
$64 \ge 64$
$54+9+1 \ge 64$
$\frac{2(27a^2b^2c^2)}{(abc)^2}+9+1 \ge 64$
$\frac{2(ab+bc+ca)^3}{(abc)^2}+(\frac{1}{a}+\frac{1}{b}+\frac{1}{c})(a+b+c)+1 \ge \frac{2(3\sqrt[3]{a^2b^2c^2})^3}{(abc)^2}+9+1 \ge 64$ by cauchy and AM-GM
$\frac{2(ab+bc+ca)^3}{(abc)^2}+(\frac{1}{a}+\frac{1}{b}+\frac{1}{c})(a+b+c)+1 \ge 64$
$\frac{(ab+bc+ca)^3}{(abc)^2}+\frac{(ab+bc+ca)^3}{(abc)^2}+(\frac{1}{a}+\frac{1}{b}+\frac{1}{c})(a+b+c)+1 \ge 64$
$(\frac{ab+bc+ca}{abc})^3abc+(\frac{ab+bc+ca}{abc})^2(ab+bc+ac)+(\frac{1}{a}+\frac{1}{b}+\frac{1}{c})(a+b+c)+1 \ge 64$
$(\frac{1}{a}+\frac{1}{b}+\frac{1}{c})^3abc+(\frac{1}{a}+\frac{1}{b}+\frac{1}{c})^2(ab+bc+ac)+(\frac{1}{a}+\frac{1}{b}+\frac{1}{c})(a+b+c)+1 \ge 64$
$abc+ab+bc+ac+a+b+c+1 \ge 64$
$(a+1)(b+1)(c+1) \ge 64$

https://web.evanchen.cc/textbooks/OTIS-Excerpts.pdf

i just realized

by ryanbear, Oct 7, 2023, 11:50 PM

I have solved an ISL G3 before and never realized until now
(2006 ISL G3)

bruh moment

by ryanbear, Oct 4, 2023, 10:19 PM

this random code I wrote in 2020 is the reason why my code right now didn't work

(note: the code I previously wrote had a file name of "code.py" and my code used the doctest library)
This post has been edited 1 time. Last edited by ryanbear, Oct 4, 2023, 10:19 PM

How to pronounce USAJMO?

by ryanbear, Oct 2, 2023, 7:52 PM

9Poll:
How to pronounce USAJMO?
22 Votes
50%
(11)
50%
(11)
Hide Results Show Results
You must be signed in to vote.
$                                  $

July 2021 Mock AMC 10/12

by ryanbear, Sep 30, 2023, 9:40 PM

Score: 123
Distrib: 11111 11111 111B1 11111 BBBBB

almost sillied:
P4: thought euler totent of 10 was 6
P6: got a=2, b=3 first and thought it was maximum
P13: thought the integers were from 1 to 9, but my answer wasn't an answer choice
P15: accidentally wrote -225 as 225, but my answer wasn't an answer choice
P16: forgot that order mattered and thought things like 7,4,6 worked, but my answer wasn't an answer choice
P18: forgot about 49, but answer wasn't answer choice
P19: forgot the ones that were like (10 01 10)
This post has been edited 1 time. Last edited by ryanbear, Oct 1, 2023, 11:21 AM

random sol i wrote a while ago

by ryanbear, Sep 29, 2023, 4:48 PM

Problem: Let $a, b, c$ be the roots of the equation $x^3 + 2023x^2 + 2 = 0$. Evaluate $(\frac{ab}{c^2}+\frac{bc}{a^2}-3)(\frac{bc}{a^2}+\frac{ca}{b^2}-3)(\frac{ca}{b^2}+\frac{ab}{c^2}-3)$
https://cdn.discordapp.com/attachments/1140707511859679364/1157462943680700528/image.png?ex=6518b2de&is=6517615e&hm=ce0b4e25b0c63bdb299029d8b04f6aa4dc61df2156a629d3488d3da6a50ca4de&
This post has been edited 1 time. Last edited by ryanbear, Sep 30, 2023, 11:55 AM

goals for end of 9th grade (oly)

by ryanbear, Sep 28, 2023, 11:08 PM

NT: be able to solve most N1s and easier N2s
Geo: solve the average G1
Alg: solve easier A1s
Combo: solve easier C1s with a 50% chance

Note: I have no idea how much i will improve and how hard isls are so this is very inaccurate

2021 AMC 12A

by ryanbear, Sep 26, 2023, 4:57 PM

Score: 132
66666 66666 66666 6B66B B66B6
3 final five solves is nice

I solved an N2

by ryanbear, Sep 22, 2023, 12:30 PM

sol might be wrong because I don't think anyone who posted their sol did exactly what I did
this problem was easier than I thought
Quote:
Find all positive integers $n>2$ such that
$$ n! \mid \prod_{ p<q\le n, p,q \, \text{primes}} (p+q)$$
sol

susususus

by ryanbear, Sep 18, 2023, 7:42 PM

3 months ago someone hearted a random scratch game I made 6 years ago with 2 views

Area of parabola

by ryanbear, Sep 12, 2023, 5:14 PM

Q: Find the area under $x^2$ from $0$ to $1$.
A: Split the graph into small rectangles, each with length $h$.
https://cdn.artofproblemsolving.com/attachments/e/b/a9f54b8f7c26c39b1783dca82c257bb5aeb6fe.png
The area of the $n$th rectangle is $h*(n*h)^2=h^3n^2$.
So the area of all the rectangles is $\sum_{n=1}^{\frac{1}{h}} h^3n^2=h^3\sum_{n=1}^{\frac{1}{h}}n^2=h^3*(\frac{(\frac{1}{h})(\frac{1}{h}+1)(\frac{2}{h}+1)}{6})=\frac{h^2+3h+2}{6}$. This area is more accuriate when $h$ is closer to $0$, and when $h=0$, this results in $\boxed{\frac{1}{3}}$

working on perimeter next
This post has been edited 1 time. Last edited by ryanbear, Sep 12, 2023, 5:15 PM

FTW moments

by ryanbear, Sep 8, 2023, 7:30 PM

https://cdn.discordapp.com/attachments/1140707511859679364/1149893370538369034/image.png
https://cdn.discordapp.com/attachments/1140707511859679364/1149892300852445254/image.png
https://cdn.discordapp.com/attachments/1140707511859679364/1149892232011317338/image.png
https://cdn.discordapp.com/attachments/1140707511859679364/1149891268047028285/image.png
https://cdn.discordapp.com/attachments/1140707511859679364/1149891108726378586/image.png
https://cdn.discordapp.com/attachments/987166615000985700/1149894032483422208/image.png

note: i did not take the first and third images
This post has been edited 1 time. Last edited by ryanbear, Sep 8, 2023, 7:32 PM

Way too easy mock amc10

by ryanbear, Sep 4, 2023, 10:37 PM

I did a random mock amc10 from a book and got a 150 after 55 minutes
P25 was just one obvious similar triangle and the solution was 3 lines

1500 FTW rating

by ryanbear, Sep 2, 2023, 9:45 AM

:wow: :wow: :wow: :wow: :wow:
Attachments:

MSM be like

by ryanbear, Aug 31, 2023, 2:50 PM

someone asks an actual question and then everyone accuses him for postfarming/trolling

AIME P13 headsolve

by ryanbear, Aug 26, 2023, 4:29 PM

Find the least positive integer $n$ for which $2^n + 5^n - n$ is a multiple of $1000$.

my sol

When headsolving, I did the very last part using rounding instead of directly calculating it out

omg ryanbear so orz

by juicetin.kim, Aug 24, 2023, 8:00 PM

so orzorzorz

how can i say anything except

ryanbear orzorzorz

i can say other things tho
that is because i can say

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I solved an FE

by ryanbear, Aug 24, 2023, 4:54 PM

This is the 2nd FE I ever solved.
Quote:
If $f$ is continuous, solve $f(f(x+y))=f(x)+f(y)$ over the reals

Let $f(0)=c$

$P(x+y,0)$ --> $f(f(x+y))=f(x+y)+c=f(x)+f(y)$
$f(x+y)-c=f(x)+f(y)-2c$

Let $g(x)=f(x)-c$
$g(x+y)=g(x)+g(y)$
So by cauchy, $g(x)$ is linear and $f(x)$ is linear

So plugging in $f(x)=ax+b$ results in $a(a(x+y)+b)+b=ax+b+ay+b$
$a^2x+a^2y+ab+b=ax+ay+2b$
$x(a^2-a)+y(a^2-a)+ab+b-2b=0$
$a=1, b=\text{anything}$ or $a=0,b=0$
$\boxed{f(x)=x+c \text{ or } f(x)=0}$

More nice FTW stats

by ryanbear, Aug 21, 2023, 11:07 PM

$                                     $
Attachments:

JMPSC 1434

by ryanbear, Aug 19, 2023, 2:53 PM

13*3+8*7=95 (div 1)
only made 4 sillies
rank: 23 or 24th
JMPSC problem quality orzorzorz
This post has been edited 1 time. Last edited by ryanbear, Aug 20, 2023, 9:32 AM

i lost the game

by ryanbear, Aug 16, 2023, 7:24 PM

I just realized the p-adic symbol isn't just "v"

ftw grind

by ryanbear, Aug 14, 2023, 2:49 PM

I played 15 ftw games today and all of them were unrated

Think academy mock amc10

by ryanbear, Aug 13, 2023, 11:48 AM

Score: 115.5
Distrib: [17]060BBBBB
All the final five was geo and combo
I got all NT and Alg problems correct

AMC Trivial Problem Set

by ryanbear, Aug 13, 2023, 10:00 AM

ANMC Y2 (mock amc10)

by ryanbear, Aug 10, 2023, 11:21 AM

Score: 118.5
Distrib: 66666 66666 66666 B666B BBBBB
Couldn't draw diagram for p16 and spent too long bashing p17 out

very hard problem set

by ryanbear, Aug 6, 2023, 9:00 PM

AMC Trivial Problem Set

by ryanbear, Aug 4, 2023, 3:00 PM

Nice FTW Stats

by ryanbear, Aug 3, 2023, 2:03 PM

$                    $
Attachments:

AMC trivial problem set

by ryanbear, Aug 3, 2023, 12:16 PM

­­­­­­­­­­­­

by ryanbear, Dec 1, 2022, 6:11 PM

­­­­­­­­­­­­­­­­­­­­­­­

­­­­­­­­­­­­­­­­­­­­­­­­­

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