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Arthur

Hopeful mathematics student with some competition level problem solving experience. Studying algebraic topology and algebraic geometry at the moment, but I feel like anyone who know anything know more than I do.

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Top Questions
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177
Why is the product of two rotation matrices not commutative?
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138
Is it impossible to perfectly fit a polynomial to a trigonometric function on a closed interval?
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105
Why is Euler's number $2.71828$ and not anything else?
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88
Are polynomials with the same roots identical?
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87
Are there primes of every possible number of digits?
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73
Can you give me some concrete examples of magmas?
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69
What isn't a vector space?
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60
What knot is this?
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58
Is it possible to find an infinite set of points in the plane where the distance between any pair is rational?
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58
Why are some non elementary integrals defined and others are not?
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57
Why are some coins Reuleaux triangles?
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52
Another proof that dividing by $0$ does not exist -- is it right?
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51
Odd Number of Cats?
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46
How can I argue that for a number to be divisible by 144 it has to be divisible by 36?
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42
Shortest proof for 'hairy ball' theorem
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41
How could $\varnothing$ be unique if it could be vacuously false?
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41
Is it simply a coincidence that if you differentiate the formula for the volume of sphere you get the formula for the surface area of sphere?
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40
Why is a circle not a convex set?
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39
How local is the information of a derivative?
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38
Why does this age calculation trick work?
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37
Why does Principal Vagina say, "no relation" after introducing himself?
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37
Factorization of quartic polynomial.
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36
What is the probability that the digit sum of a randomly chosen integer between 0000 and 9999 is divisible by 5?
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36
Why did we expect gravitational mass and inertial mass to be different?
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35
What is the error in this fake proof which uses series to show that $1=0$?
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35
how to prove the chain rule?
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34
Why is $\sinh(45°)$ not infinity? How does it ever intersect with the hyperbola, seeing as it goes along the asymptote?
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32
What comes after length, area and volume?
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31
Make e using 1, 2, 3, 4, 5, 6, 7, 8, 9
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31
Is it possible to construct a strictly monotonic sequence of all rational numbers?
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