Rudy the Reindeer
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 Apr 24 awarded Nice Question Apr 3 revised Non-Integrability of a Pfaffian - Geometric Interpretation? Tried to improve tags in order to increase chance of an answer. Apr 1 awarded Good Question Mar 25 revised Is a projective space a vector space? If not, what of a basis? Formatting added. Mar 24 awarded Popular Question Mar 19 revised No. of elements in the set $\{z\in \mathbb{C}: z^n=-1 \}$ edited tags Mar 19 answered Find the matrix of a linear transformation Mar 19 awarded metric-spaces Mar 18 awarded Guru Mar 18 revised Continuous function on a compact metric space is uniformly continuous added 9 characters in body Mar 18 comment Continuous function on a compact metric space is uniformly continuous @Theo Oh, I see now what you mean! All this time I thought people where saying the $\delta$ were off by a factor of $2$. Duh. Of course one has to replace $\varepsilon$ by ${\varepsilon \over 2}$. The proof stays the same though. Mar 18 revised Continuous function on a compact metric space is uniformly continuous added 69 characters in body Mar 18 comment Continuous function on a compact metric space is uniformly continuous @Theo No: In the second paragraph the $\delta_i$ are actually equal to ${\delta_i \over 2}$ from the first paragraph. I believe this to be the factor of two that everybody is criticising in the comments. Right, that's the factor you are talking about? Mar 11 awarded Popular Question Mar 11 revised If $d$ is a metric and $f$ a function when is $d \circ f$ a metric? added 2 characters in body Mar 7 comment A polynomial that is zero on an open set This is not clear to me: Consider for example the polynomial $p(x,y) = xy$. Then this has degree one but $|\mathbb R|$ many roots. What am I missing? Feb 29 comment Munkres' Topology Problem @GiuseppeNegro Thanks for the link! Feb 28 comment Munkres' Topology Problem @DanielFischer I feel like a year ago I could do proofs like this with my eyes closed. Then I spent a year not doing any topology and now I can't even do the most basic thing. How depressing. Maybe my brain is broken. Feb 28 comment Munkres' Topology Problem @DanielFischer I deleted my shitey "answer". Feb 28 comment Munkres' Topology Problem @DanielFischer Hmmm. I am missing something. Why can the intersection not be closed while $A_\alpha$ aren't?