Grigory M
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 Jul24 revised The Name for $\mathbb{R}$, $\mathbb{C}$, $\mathbb{H}$ and $\mathbb{O}$ Exclusively Algebras? edited tags Jul20 revised Is at least one of $6k + 1$ or $6k-1$ prime? edited tags Jul18 revised Eilenberg-Maclane space $K(G\rtimes H, 1)$ for a semi-direct product. edited tags Jul17 revised What does the colon use in the decimal place mean? edited tags Jul15 revised How to find the length of diagonal of a rhombus rolled back to a previous revision Jul14 revised if each each of two natural numbers a and b is a sum of two squares then ab is also a sum of two squares more descriptive title Jun15 revised Gauss-type sums for cube roots One concrete positive result added (+a typo fixed) Jun2 revised CHECK: Let p be a prime number. Show that $\binom{2p}{p}$ is congruent to $2$ mod $p$. edited tags May26 revised Spin manifold and the second Stiefel-Whitney class texified May23 revised Let $a,m,n \in \mathbf{N}$. Show that if $\gcd(m,n)=1$, then $\gcd(a,mn)=\gcd(a,m)\cdot\gcd(a,n)$. edited tags May23 revised Find all integers $n$ (positive, negative, and zero) so that $n^2 + 1$ is divisible by $n + 1$. edited tags May21 revised Direct proof that for a prime $p$ if $p\equiv 1 \bmod 4$ then $l(\sqrt{p})$ is odd. edited tags May21 revised Open covers by simply connected sets and fundamental group more descriptive title May20 revised Fibonacci combinatorial identity edited tags May20 revised Finding integral solutions to the equation $x^4-ax^3-bx^2-cx-d=0$ edited title May19 revised notation used in algebraic topology edited tags May18 revised Proof that the subalgebra generated by any two elements of $\mathbb{O}$ is isomorphic to $\mathbb{R}$, $\mathbb{C}$, or $\mathbb{H}$ edited tags May18 revised Unit or non-zero octonions form an $A_\infty$-space? added 180 characters in body May18 revised Quaternionic veronese Embedding link fixed May18 revised differential in AHSS for spin cobordism more tags