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Apr
12
awarded  Yearling
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23
awarded  Revival
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awarded  Yearling
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awarded  Yearling
Apr
8
comment Differential Geometry without General Topology
Yeah; Spivak seems to cover all the topology he needs in his books. If you're up for Spivak's five-volume magnum opus, go for it!
Apr
4
answered Differential Geometry without General Topology
Mar
18
revised Conformally immersed Riemann surfaces and foliations
added long comment
Mar
15
comment Conformally immersed Riemann surfaces and foliations
What exactly do you mean by pushing $\Sigma$ along the frame?
Mar
13
answered Conformally immersed Riemann surfaces and foliations
Mar
6
revised Help understanding manifolds and topological spaces
added image
Mar
6
answered Help understanding manifolds and topological spaces
Mar
6
comment Collecting definitions of continuity.
Perhaps my community wiki comment was therefore out of line.
Mar
6
comment Collecting definitions of continuity.
meta.math.stackexchange.com/questions/941/…
Mar
6
comment Collecting definitions of continuity.
Should this be community wiki & big list?
Mar
6
comment Question about partition of open sets in $\mathbb{R^n}$
No connected open set is the disjoint union of two or more nonempty open sets. So not all of your limited rectangles can be open.
Mar
6
revised A continuous map that fixes the boundary of a domain pointwise is surjective
pointed out error as per G. Smith
Mar
6
comment A continuous map that fixes the boundary of a domain pointwise is surjective
-blush- Well, I suppose I ought to leave this nonanswer up as a warning to those attempting a solution without using more heavy machinery. It's so tempting.
Mar
2
comment Picture of a 4D knot
LOL! No, literally, I mean it.
Mar
2
answered A continuous map that fixes the boundary of a domain pointwise is surjective
Mar
2
revised Picture of a 4D knot
added diagram; italicized titles; referenced Carter, Kamada, and Saito