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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”.
Apr
7
accepted Can the sum of reciprocals of a set without density converge?
Apr
7
comment Can the sum of reciprocals of a set without density converge?
Thanks, this settles it quite nicely.
Apr
7
comment How can we detect if a topological space has “holes”.
Thanks, how much harder would you say the extra "lo" makes the subject?