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Sep
30
awarded  Explainer
Aug
18
awarded  Yearling
Aug
14
revised Is it possible to build a metal wire sphere whose shadow projects the 2d conformal maps of the Riemann Sphere on a flat wall?
another video
Aug
14
comment Is it possible to build a metal wire sphere whose shadow projects the 2d conformal maps of the Riemann Sphere on a flat wall?
Yes. This is illustrated at minute 2:00 in the following video. youtube.com/watch?v=0z1fIsUNhO4 -- the entire video is really excellent, by the way.
Aug
14
answered Explanation of non-orientability of the Möbius band
Aug
14
comment Explanation of non-orientability of the Möbius band
Which book are you referring to? "An introduction to manifolds"? By Loring Tu? I ask because the discussion of the Mobius band is on page 241, not page 208...
Aug
14
answered Is it possible to build a metal wire sphere whose shadow projects the 2d conformal maps of the Riemann Sphere on a flat wall?
Aug
3
comment Mapping Class Group
I've edited my answer to your second question to be just a reference to the Primer.
Aug
3
revised Mapping Class Group
deleted some of the anwser to give a reference instead.
Aug
2
comment Mapping Class Group
Yes - I meant geometric intersection. I'm not sure why you mention homology here.
Aug
2
answered Mapping Class Group
Aug
2
revised Mapping Class Group
fixed grammar and math typos
May
18
comment Deciding which questions to do in a maths exam
In a university or school exam, you should read the whole test before starting on the problems.
May
17
reviewed Approve suggested edit on Derivative of $\Gamma$ at $1$
May
16
revised Another differential topology lemma
rolled back to a previous revision
May
16
revised Another differential topology lemma
rolled back to a previous revision
May
16
awarded  Cleanup
May
16
revised A differential topology lemma
rolled back to a previous revision
May
2
comment Why does the Mandelbrot set contain (slightly deformed) copies of itself?
There are some references for this business about $M$ at $c$ resembling $J_c$ here: math.stackexchange.com/questions/32062/…
Mar
28
reviewed Approve suggested edit on How do I prove that the sequence $\frac{n}{n^2+1}$ is convergent?