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T..'s user avatar
T..'s user avatar
T..
  • Member for 13 years, 8 months
  • Last seen more than 12 years ago
40 votes

Why is a circle in a plane surrounded by 6 other circles?

36 votes

Is there a quick proof as to why the vector space of $\mathbb{R}$ over $\mathbb{Q}$ is infinite-dimensional?

33 votes
Accepted

If all sets were finite, how could the real numbers be defined?

32 votes
Accepted

Prove that this function is bounded

30 votes
Accepted

StarCraft II: Ladder math

28 votes
Accepted

Proving a known zero of the Riemann Zeta has real part exactly 1/2

27 votes

What is the importance of the Collatz conjecture?

26 votes

Proof that Pi is constant (the same for all circles), without using limits

21 votes
Accepted

Understanding Black-Scholes

20 votes

Boy Born on a Tuesday - is it just a language trick?

19 votes

Real world uses of hyperbolic trigonometric functions

18 votes

Why would I want to multiply two polynomials?

16 votes
Accepted

Convergence of $np(n)$ where $p(n)=\sum_{j=\lceil n/2\rceil}^{n-1} {p(j)\over j}$

16 votes
Accepted

Are there infinitely many primes of the form $4n^{2}+3$?

15 votes

How fundamental is the fundamental theorem of algebra?

14 votes

Wedge product and cross product - any difference?

14 votes
Accepted

A recurrence that wiggles?

14 votes

Prove that this function is bounded

14 votes
Accepted

Why does a convex set have the same interior points as its closure?

14 votes
Accepted

does $\sum_{n=1}^{\infty} \frac{1}{\zeta(1+\frac{1}{n})}$ diverge or converge?

13 votes
Accepted

On Zeta function zeros in the critical strip

13 votes

Importance of Cayley's theorem

13 votes
Accepted

If $\sum_{n=1}^{\infty} a_{n}^{3}$ converges does $\sum_{n=1}^{\infty} \frac{a_{n}}{n}$ converge?

12 votes
Accepted

Collective Term for $XY, YZ$ and $ZX$ Planes

12 votes

Inverse of $y=xe^x$

11 votes

Exercise from Comtet's Advanced Combinatorics: prove $27\sum_{n=1}^{\infty }1/\binom{2n}{n}=9+2\pi \sqrt{3}$

11 votes
Accepted

Why does a circle enclose the largest area?

10 votes

Proving the Riemann Hypothesis without revealing anything other than you proved it

10 votes
Accepted

Elementary number theory results that are not generalized by ring or group theory

10 votes

Uses of quadratic reciprocity theorem

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