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Top Questions
57
votes
The $100$th derivative of $(x^2 + 1)/(x^3 - x)$
calculus
derivatives
asked Aug 17, 2012 at 4:10
math.stackexchange.com
22
votes
Intuition behind Cantor-Bernstein-Schröder
functions
elementary-set-theory
intuition
asked Oct 30, 2012 at 22:15
math.stackexchange.com
14
votes
2012 Putnam Exam A3
analysis
contest-math
asked Dec 4, 2012 at 4:49
math.stackexchange.com
14
votes
1965 Putnam, B2
combinatorics
contest-math
asked Sep 20, 2013 at 0:15
math.stackexchange.com
12
votes
$\pi$, Dedekind cuts, trigonometric functions, area of a circle
geometry
analysis
trigonometry
asked Oct 20, 2012 at 2:57
math.stackexchange.com
10
votes
isomorphism of Dedekind complete ordered fields
analysis
field-theory
ordered-fields
asked Jan 2, 2013 at 19:56
math.stackexchange.com
8
votes
Group of sphere transformations, impressing friends
abstract-algebra
group-theory
puzzle
recreational-mathematics
asked Nov 17, 2012 at 0:05
math.stackexchange.com
8
votes
Even integer approximations to multiples of pi
number-theory
analysis
approximation
asked Feb 19, 2013 at 22:14
math.stackexchange.com
8
votes
Solving $x^p + y^p = p^z$ in positive integers $x,y,z$ and a prime $p$
elementary-number-theory
diophantine-equations
asked Feb 24, 2014 at 23:19
math.stackexchange.com
8
votes
Circle rotating within a circle (roulette)
geometry
circle
vectors
parametric
asked Sep 17, 2014 at 23:52
math.stackexchange.com
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Top Answers
15
Rigorous nature of combinatorics
math.stackexchange.com
14
Straightedge-only construction of a perpendicular
math.stackexchange.com
9
How to find $\lim_{n\to\infty}\frac{1!+2!+\cdots+n!}{n!}$?
math.stackexchange.com
9
Verifying a proof that if $x,y,z \geq 0$ and $x+y+z = 1$, then $0 \le xy + yz + zx - 2xyz \le \frac{7}{27}$
math.stackexchange.com
9
Infinite square-rooting
math.stackexchange.com
6
If a number is rational, then it has a periodic decimal expression?
math.stackexchange.com
5
How closely packed can the points of a compact metric space be?
math.stackexchange.com
5
Proof the set $\mathbb{Z}_p$ is a field
math.stackexchange.com
5
Construction of the real numbers using Dedekind cuts
math.stackexchange.com