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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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