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Apr
14
revised Albert, Bernard and Cheryl popular question (Please comment on my theory)
added 1 character in body
Apr
14
comment Albert, Bernard and Cheryl popular question (Please comment on my theory)
So basically you are going with the second case?
Apr
14
revised Albert, Bernard and Cheryl popular question (Please comment on my theory)
deleted 595 characters in body
Apr
14
asked Albert, Bernard and Cheryl popular question (Please comment on my theory)
Apr
12
comment Category Theory textbook (learning through guided discovery Dummit and Foote)
Thanks, I already own this one, it is really good.
Apr
11
awarded  Citizen Patrol
Apr
9
answered How to formally prove: if d|(da+b), then d|b?
Apr
8
revised Problem on a square group
deleted 5 characters in body
Apr
8
revised Problem on a square group
deleted 4 characters in body
Apr
8
answered Problem on a square group
Apr
8
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?
Apr
8
comment How to get points of lines tangent to 2 circles
I don't understand what you mean by finding.
Apr
8
answered Must PID contain 1?
Apr
8
answered Prove that if $a$ and $a-1$ are relatively prime to $n$ then $1+a+a^2+\cdots+a^{\varphi(n)-1}\equiv 0 \pmod n$
Apr
8
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 $a^{\varphi(n)-1}$?
Apr
8
answered How can I prove the inverse of a function is odd?
Apr
8
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?
Apr
7
awarded  Enlightened
Apr
7
awarded  Nice Answer
Apr
7
accepted How can we detect if a topological space has “holes”.