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ccorn
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33
How prove this $\sum_{k=1}^{2^{n-1}}\sigma{(2^n-2k+1)}\sigma{(2k-1)}=8^{n-1}$
Jul 17, 2013
30
Galois group of $x^4-5$
Jan 6, 2014
22
Coefficient of $n$th cyclotomic polynomial equals $-\mu(n)$
Apr 3, 2014
22
Is there a good way to compute Christoffel Symbols
Apr 10, 2016
15
Binomial Identity $\sum\binom{2n+1}{2k+1}\binom{m+k}{2n} = \binom{2m}{2n}$
Dec 11, 2013
15
I found this odd relationship, $x^2 = \sum_\limits{k = 0}^{x-1} (2k + 1)$.
Mar 3, 2014
15
Common Math Mistakes Made by Scientists
Nov 22, 2013
15
Generalizing the sum of consecutive cubes $\sum_{k=1}^n k^3 = \Big(\sum_{k=1}^n k\Big)^2$ to other odd powers
Nov 6, 2013
14
What is the norm function in $\mathcal{O}_{\mathbb{Q}(\zeta_8)}$?
Sep 24, 2018
14
Ramanujan's tau function identity
Jul 16, 2015

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Are the machines upon us?
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Mathematics new site theme is live
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Why do people think downvotes need explanation?
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What is the record for the fastest close vote, and which question achieved this accolade?

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30
Makefile prepend and append all elements in array
16
A new (2018) update to our Terms of Service is here
13
Test of 3rd-order vs 4th-order symplectic integrator with strange result
12
Why can't I list a directory with read permissions?
10
Representing Eisenstein numbers without floats