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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

13 votes

Composition of Derangements

co.combinatorics permutations asked Nov 1 '16 at 5:35

mathoverflow.net

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

Top Answers

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2013 USAMO problem 5

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Coloring 5 Largest Numbers in Each Row and Column Yields at Least 25 Double-Colored Numbers

math.stackexchange.com

Show that $\sum_{k=1}^n a_k=3/4$.

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Derivative of $\sqrt{\sin (x^2)}$

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What is the meaning of exponentials to real powers for which series don't exist?

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Coloring 5 Largest Numbers in Each Row and Column Yields at Least 25 Double-Colored Numbers

Composition of Derangements

$l^\infty(I)$ and $l^\infty(J)$ isometrically isomorphic with $|I| \not= |J|.$

Traveling Salesman Variant - Greedy Algorithm based on Least Cost better than that based on Highest

Partitioning Binomial Coefficients into Four Groups with Equal Sum

Existence of Homomorphism so that Diagram Commutes

Approximating Integrable Simple Functions by Step Functions

Expected Number of Steps to Order First n Integers