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sperners lemma
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every number is two squares and a cube

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30
When is $1^5 + 2^5 + \ldots + n^5$ a square?
Oct 19, 2012
20
Fourier transform of fourier transform?
Nov 20, 2012
11
Maybe Things Can be Divided by Zero
Nov 10, 2012
11
Leading Digit of $2^{4242}$
Nov 15, 2012
10
Show that $121^{n}-25^{n}+1900^{n}-(-4)^{n}$ is divisible by 2000.
Oct 30, 2012
9
How do I get the integer part of a number by using basic arithmetic?
Nov 21, 2012
9
Proving Functions are Surjective
Nov 12, 2012
8
How many sequences of consecutive integers are there where the sum equals the length
Nov 9, 2012
8
How to find the roots of $x³-2$?
Oct 25, 2012
7
Opposite category functor
Nov 10, 2012
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Why is this certificate valid for so many domains?
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Could this solve SQL injection and XSS vulnerabilities?