Gamamal
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 Apr14 asked Albert, Bernard and Cheryl popular question (Please comment on my theory) Apr12 comment Category Theory textbook (learning through guided discovery Dummit and Foote) Thanks, I already own this one, it is really good. Apr11 awarded Citizen Patrol Apr9 answered How to formally prove: if d|(da+b), then d|b? Apr8 revised Problem on a square group deleted 5 characters in body Apr8 revised Problem on a square group deleted 4 characters in body Apr8 answered Problem on a square group Apr8 comment How to get points of lines tangent to 2 circles there is a way to construct the tangents between two circles, would this be of help? Apr8 comment How to get points of lines tangent to 2 circles I don't understand what you mean by finding. Apr8 answered Must PID contain 1? Apr8 answered Prove that if $a$ and $a-1$ are relatively prime to $n$ then $1+a+a^2+\cdots+a^{\varphi(n)-1}\equiv 0 \pmod n$ Apr8 comment Prove that if $a$ and $a-1$ are relatively prime to $n$ then $1+a+a^2+\cdots+a^{\varphi(n)-1}\equiv 0 \pmod n$ are you sure the sum is up to $a^{\varphi(n)}$ and not $a^{\varphi(n)-1}$? Apr8 answered How can I prove the inverse of a function is odd? Apr8 comment If $f$ is midpoint convex, continuous, and two times differentiable, then for any $a, b \in \mathbb{R}$, there exists $c$ such that $f''(c) \geq 0$ Is the function two times differentiable? Apr7 awarded Enlightened Apr7 awarded Nice Answer Apr7 accepted How can we detect if a topological space has “holes”. Apr7 accepted Can the sum of reciprocals of a set without density converge? Apr7 comment Can the sum of reciprocals of a set without density converge? Thanks, this settles it quite nicely. Apr7 comment How can we detect if a topological space has “holes”. Thanks, how much harder would you say the extra "lo" makes the subject?