Top network posts

• 28 How prove this $\sum_{k=1}^{2^{n-1}}\sigma{(2^n-2k+1)}\sigma{(2k-1)}=8^{n-1}$
• 22 Galois group of $x^4-5$
• 16 A new (2018) update to our Terms of Service is here
• 16 Is there a good way to compute Christoffel Symbols
• 15 Binomial Identity $\sum\binom{2n+1}{2k+1}\binom{m+k}{2n} = \binom{2m}{2n}$
• 14 Generalizing the sum of consecutive cubes $\sum_{k=1}^n k^3 = \Big(\sum_{k=1}^n k\Big)^2$ to other odd powers
• 13 Coefficient of $n$th cyclotomic polynomial equals $-\mu(n)$
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