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NP-Completeness of the decision problem for the generalized 15-puzzle

cc.complexity-theory np np-complete asked Feb 21 at 10:08

cstheory.stackexchange.com

28 votes

$n$th derivative of $e^{1/x}$

calculus sequences-and-series binomial-coefficients asked Jan 20 '11 at 10:52

math.stackexchange.com

19 votes

Global invertibility of a map $\mathbb{R}^n\to \mathbb{R}^n$ from everywhere local invertibility

calculus real-analysis analysis asked May 26 '11 at 19:45

math.stackexchange.com

18 votes

Connecting a $n, n$ point grid

geometry graph-theory puzzle asked Feb 13 '11 at 14:48

math.stackexchange.com

18 votes

Interesting integral formula

real-analysis integral integration asked Jun 12 '11 at 8:54

math.stackexchange.com

12 votes

Distinctness is maintained after adding some element to all sets

combinatorics extremal-combinatorics asked Jan 11 '11 at 18:52

math.stackexchange.com

12 votes

Mathematical journal for an undergraduate

reference-request asked Apr 8 '12 at 14:50

math.stackexchange.com

10 votes

Longest cycle contained in two cycles

graph-theory np-complete decision-problem asked May 20 at 7:07

cs.stackexchange.com

9 votes

Showing $\left|\frac{a+b}{2}\right|^p+\left|\frac{a-b}{2}\right|^p\leq\frac{1}{2}|a|^p+\frac{1}{2}|b|^p$

real-analysis inequality convex-analysis asked Dec 30 '11 at 23:44

math.stackexchange.com

8 votes

Convergence of $a_{n+1}=\frac{1}{1+a_n}$

real-analysis sequences-and-series convergence asked May 12 '11 at 18:29

math.stackexchange.com

Top Answers

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Bad Fraction Reduction That Actually Works

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math.stackexchange.com

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math.stackexchange.com

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square squares with diagonals also squares

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math.stackexchange.com

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math.stackexchange.com

Fastest way to calculate $e^x$ upto arbitrary number of decimals?

math.stackexchange.com

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math.stackexchange.com

Cracking Playfair code

math.stackexchange.com