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8
votes
Degree one self-map of $\Bbb R^2\big\backslash \big\{(n,0):n\in \Bbb Z\big\}$ not homotopic to any self-homotopy equivalence
at.algebraic-topology
gt.geometric-topology
differential-topology
manifolds
surfaces
asked Apr 26, 2021 at 5:57
mathoverflow.net
5
votes
Representation of elements of fundamental group by shortest loops
algebraic-topology
riemannian-geometry
surfaces
geometric-topology
covering-spaces
asked Jan 17, 2021 at 4:39
math.stackexchange.com
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