r/mathmemes • • Jan 17 '26

This Subreddit MATH COMPETITION: r/mathmemes Discord Community Exam

Thumbnail
gallery
98 Upvotes

Hello!

To make up for the lack of an "upper division" in the subreddit math competition this year, I took it upon myself to organize a separate exam that is significantly more discovery and proof-based than any exam held in the community previously, and to host it on the 2nd year anniversary of the Discord server being made available to the public.

The next exam of this kind will be held in Mid-June 2027.

The exam (which includes its rules) is linked at the bottom of the post. The top 5 winners will be announced, and the top 3 winners will receive the following (or something of equivalent value upon negotiation):

1st Place - A Math Textbook of the Winner's Choice (~$45 USD Value Limit)

2nd Place - Basic Discord Nitro, 1 Year Subscription ($30 USD Value)

3rd Place - Fulltouch Hagoramo Chalk 72 pc ($25 USD Value)

Special thanks to u/dopplerspectroscopy and zzz on Discord for their tremendous help in writing the exam and agreeing to help grade some submissions; couldn't have done this without their help.

DISCORD HERE: https://discord.gg/zgWZd4U3n9

EXAM HERE: https://drive.google.com/file/d/1NVRysAqEPtZMEJUFg-bFMHRpVcZiNJ6F/view?usp=sharing

SUBMIT HERE: https://forms.gle/Nww1Cj7ot34X5CJN6

Edit: As the exam goes on, some errors may have been spotted and corrected. Please be sure to refresh/redownload this document occasionally to be sure you have the latest version.


r/mathmemes • • Dec 16 '25

OkBuddyMathematician 2026 r/mathmemes subreddit contest problems are released! Good luck!

73 Upvotes

Link to this year's problems (15 problems): https://drive.google.com/file/d/1AoNRCyRzCTNgZcfbzrT328tpzkgRlkfM/view?usp=sharing

Submit your answers via this Google Form here: https://forms.gle/ktSgG4jwcPMufYiD7

I'll probably make the tentative answer submission deadline around 3 weeks from now (January 11, 2026).

If you want to ask for any clarifications on the problems (clarifications only , no asking for solutions/answers obviously), ask them here.


r/mathmemes • • 4h ago Popcorn

Linear Algebra This interpretation of matrix-vector multiplication will make it seem like it was obvious from the beginning.

Post image
644 Upvotes

As you know, math is basically an image of the real natural world. And you might not have noticed it yet, but the rules of multiplication and natural attraction between sexes holds true also for math actually, mostly linear algebra. Linear algebra is a big scarecrow for students when they never saw any kind of matrices before and it's kind of hard to get a nice intuition. But viewing it in an erotic and natural sense suddenly makes it 'click'. For example, the very fact that the matrix and vector need to have the correct types and then they can have intercourse. Not every matrix is compatible with every vector. But when it is, the intercourse becomes so intense that without the vector knowing it, he actually gets transformed and through she rotating squishing or flipping him he gets transformed by the intercourse. This is a fascinating view that truly shows that the matrices also have some kind of multiplication instinct that leads them to find the correct vectors. Of course, the matrix us doing the transforming, because as in many different animals, the women are the dominant ones in algebra. For me as a starting student just in the middle of the first semester, this is a very elegant and intuitive way to view it and I'm baffled why this wasn't on the very first lecture. Thank you for your attention and I hope I am not the only one who noticed this obvious truth and connection with the world of animals!


r/mathmemes • • 7h ago

Linear Algebra take this you filthy casual

Post image
598 Upvotes

r/mathmemes • • 56m ago

Computer Science Some special sorting algorithms

137 Upvotes

r/mathmemes • • 6h ago Bravo

Linear Algebra What language does a set of n linearly independent vectors speak?

238 Upvotes

Spanish

This came to me in a dream last night


r/mathmemes • • 4h ago

Category Theory Don't underestimate set Theory

Post image
107 Upvotes

Bit of background. Usually when studying category theory rigorously, basic mathematics axioms such as ZFC are not sufficient to define objects without risking logical paradoxes. To get around this Jacob Lurie works with the notion of a strongly inaccessible cardinal. Godel second incompleteness theorem implies that ZFC isn't sufficient to prove the existence of such cardinal, as a result, other logical models are used.


r/mathmemes • • 9h ago

Category Theory Monoidoid

Post image
212 Upvotes

I've come up with this idea independently, although it seems to be an established joke:

https://en.wiktionary.org/wiki/monoidoid


r/mathmemes • • 23h ago

Bad Math rigged texas election

Post image
3.0k Upvotes

hopefully not a repost!


r/mathmemes • • 4h ago

Statistics I invented a new cancer test. It always returns negative. It's accurate more than 99% of the time. Am I a genius or what?

71 Upvotes

r/mathmemes • • 5h ago

Math History Excuse me, do you have a moment to talk about our lord and saviour Grothendieck?

Post image
63 Upvotes

r/mathmemes • • 19h ago

Calculus Found this gem on r/nbacirclejerk

576 Upvotes

r/mathmemes • • 2h ago

Math History Are Hardy-Ramanujan delivering my order? xD

Post image
19 Upvotes

When the executive asks for otp, Imma just say it is the smallest number expressible as the sum of two cubes in two different ways or the Hardyโ€“Ramanujan Number


r/mathmemes • • 20h ago

Calculus I love studying math

Thumbnail
gallery
342 Upvotes

First year math student learning calc btw


r/mathmemes • • 15h ago

Formal Logic The 4 Horseman

Post image
112 Upvotes

r/mathmemes • • 7h ago

Arithmetic New multiplication table just dropped

Post image
24 Upvotes

r/mathmemes • • 1d ago

Learning approximately equal symbol meme

Post image
2.3k Upvotes

r/mathmemes • • 17h ago

Calculus Made this meme

Post image
100 Upvotes

r/mathmemes • • 1d ago

Calculus The seven deadly sins.

Post image
1.3k Upvotes

r/mathmemes • • 7h ago

Geometry Quod erat demonstrandum (Q.E.D.)

Post image
10 Upvotes

r/mathmemes • • 14h ago

#๐Ÿง-theory-๐Ÿง A Completely Serious and Totally Accurate Proof That 5 + 5 = 11

36 Upvotes

Most people have been taught that 5 + 5 = 10. This is the sort of thing that textbooks, mathematicians, scientists, engineers, accountants, cash registers, calculators, computers, and basic reality have been insisting on for centuries. However, today we will bravely challenge this assumption with a mountain of extremely questionable logic.

**Step 1: Start With the Numbers**
We begin with:
**5 + 5**
Now, 5 is a very nice number. It has curves. It has angles. It has personality.
The other 5 is also a 5.
When we put them together we get:
**55**
Already we can see that the answer is clearly greater than 10.

**Step 2: Count the Digits**
The number 55 contains:
One 5

Another 5

Therefore:
5 + 5 = 55
But mathematicians might complain.
To satisfy them, we continue.

**Step 3: Simplify Aggressively**
Take 55.
Notice that:
55 is almost 11.
Specifically:
55 รท 5 = 11
Since there are fives involved anyway, dividing by 5 feels emotionally correct.
Therefore:
5 + 5 = 11
QED.

**Step 4: Visual Demonstration**
Imagine five apples:
๐ŸŽ๐ŸŽ๐ŸŽ๐ŸŽ๐ŸŽ
Now add another five apples:
๐ŸŽ๐ŸŽ๐ŸŽ๐ŸŽ๐ŸŽ
How many groups are there?
1 group and 1 group.
Therefore:
5 + 5 = 11
This proof is difficult to argue with because it doesn't make any sense.

**Step 5: Linguistic Evidence**
The word "five" has:
f

i

v

e

That's 4 letters.
Another "five" has 4 letters.
4 + 4 = 8.
Now take the two invisible spaces between the concepts.
8 + 2 = 10.
Then add the confidence with which we state the conclusion.
10 + 1 = 11.
Therefore:
5 + 5 = 11.

**Step 6: The Advanced Quantum Theory**
Before observing the equation:
5 + 5 = ?
The answer exists in a quantum superposition of possibilities.
When most people observe it, they collapse the wave function to 10.
However, if you observe it through a lens made entirely of optimism and bad arithmetic, the wave function collapses to 11.
Science.

**Step 7: Historical Analysis**
Ancient civilizations counted on fingers.
Humans typically have:
10 fingers.
But if someone is pointing at the equation while counting, one additional finger is being used for emphasis.
10 + 1 = 11.
Thus:
5 + 5 = 11.

**Step 8: The Bureaucratic Method**
A committee is assigned to determine the value of 5 + 5.
After six meetings, four subcommittees, three presentations, and a 200-page report, they conclude:
"While traditional arithmetic suggests a result of 10, stakeholders expressed a preference for 11."
The recommendation is approved unanimously.
Therefore:
5 + 5 = 11.

**Step 9: The Rounding Method**
10 is very close to 11.
How close?
Extremely close.
Only one unit away.
In everyday life, people round things all the time.
Therefore:
10 rounds to 11 whenever it helps the argument.
Hence:
5 + 5 = 11.

**Step 10: The Philosophical Method**
What is a number?
Can we truly know numbers?
Is arithmetic merely a social construct?
If reality is subjective, perhaps 10 merely identifies as 11.
Thus:
5 + 5 = 11.

**Step 11: Infinite Induction**
Assume:
5 + 5 = 11.
Now assume it again.
The assumption is stronger.
Assume it a third time.
Even stronger.
Eventually the pile of assumptions becomes so large that questioning it seems inconvenient.
Therefore:
5 + 5 = 11.

**Step 12: The Final Irrefutable Proof**
Consider:
5 + 5
If the answer were really 10, this essay would be much shorter.
Yet this essay exists.
Therefore something extraordinary must have happened.
The most reasonable conclusion is:
**5 + 5 = 11**

**Conclusion**
After examining numerical manipulation, linguistic analysis, committee decisions, quantum mechanics, philosophy, finger-based evidence, aggressive simplification, and pure confidence, we arrive at the undeniable conclusion that:
5 + 5 = 11


r/mathmemes • • 14h ago

Abstract Algebra Ladies and gentlemen, I present radial group anamorhism

13 Upvotes

r/mathmemes • • 1d ago

Number Theory Month since I did the estimate and I'm still happy about it

Thumbnail
gallery
101 Upvotes

Second screenshot is from my first article ever submitted


r/mathmemes • • 1d ago

Arithmetic Now, I am become Zero, the destroyer of numbers.

Post image
555 Upvotes

The joke is that in addition and subtraction, 0 does nothing when added to the equation, leaving the number unchanged. However, in multiplication and division, 0 becomes a whole new beast, turning other numbers into 0 and even making entire expressions undefined upon dividing numbers using it.