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 Apr14 revised Albert, Bernard and Cheryl popular question (Please comment on my theory) added 1 character in body Apr14 comment Albert, Bernard and Cheryl popular question (Please comment on my theory) So basically you are going with the second case? Apr14 revised Albert, Bernard and Cheryl popular question (Please comment on my theory) deleted 595 characters in body 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”.