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Top Questions
15
votes
Composition of Derangements
co.combinatorics
permutations
asked Nov 1 '16 at 5:35
mathoverflow.net
13
votes
Coloring 5 Largest Numbers in Each Row and Column Yields at Least 25 Double-Colored Numbers
combinatorics
recreational-mathematics
puzzle
asked Dec 12 '13 at 5:29
math.stackexchange.com
11
votes
$l^\infty(I)$ and $l^\infty(J)$ isometrically isomorphic with $|I| \not= |J|.$
homework
functional-analysis
lp-spaces
asked Feb 28 '14 at 1:02
math.stackexchange.com
10
votes
Traveling Salesman Variant - Greedy Algorithm based on Least Cost better than that based on Highest
contest-math
asked Dec 9 '16 at 20:32
math.stackexchange.com
6
votes
Partitioning Binomial Coefficients into Four Groups with Equal Sum
combinatorics
binomial-coefficients
asked Dec 11 '16 at 5:54
math.stackexchange.com
6
votes
Existence of Homomorphism so that Diagram Commutes
abstract-algebra
group-theory
asked Dec 13 '13 at 20:20
math.stackexchange.com
6
votes
Approximating Integrable Simple Functions by Step Functions
homework
real-analysis
measure-theory
asked Feb 15 '13 at 7:19
math.stackexchange.com
5
votes
Expected Number of Steps to Order First n Integers
probability
combinatorics
asked Jan 16 '13 at 8:53
math.stackexchange.com
5
votes
A special kind of knot
mathematics
asked Nov 17 '16 at 21:39
puzzling.stackexchange.com
Top Answers
20
Each person has at most 3 enemies in a group. Show that we can separate them into two groups where a person will have at most one enemy in the group.
math.stackexchange.com
19
Show that an orthogonal group is a $ \frac{n(n−1)}2 $-dim. $ C^{\infty} $-Manifold and find its tangent space
math.stackexchange.com
15
Show that $x^{8}+5x^{2}=1$ has exactly $2$ real roots
math.stackexchange.com
8
2013 USAMO problem 5
math.stackexchange.com
8
Divergence for $p$ prime numbers and convergence for $m$ composite numbers
math.stackexchange.com
7
In how many ways can a student score exactly $100$ points on four $50$ point exams? greater than $100$?
math.stackexchange.com
5
Prove $2\lfloor x\rfloor \le \lfloor2x\rfloor$
math.stackexchange.com
5
Derivative of $\sqrt{\sin (x^2)}$
math.stackexchange.com
5
Show that $\sum_{k=1}^n a_k=3/4$.
math.stackexchange.com
5
What is the meaning of exponentials to real powers for which series don't exist?
math.stackexchange.com
5
How many zeros are there at $1000!$ in the base $24$
math.stackexchange.com
5
Coloring 5 Largest Numbers in Each Row and Column Yields at Least 25 Double-Colored Numbers
math.stackexchange.com
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