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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

2 votes
Accepted

Truncated exact sequence of homotopy groups

Check out the paper "A Vietoris Mapping Theorem for Homotopy," by S. Smale, Proc. Amer. Math. Soc. 8 (1957), 604-610, available at http://www.jstor.org/stable/2033527 . Paraphrase of the main theore …
Allan Edmonds's user avatar
11 votes

Restriction of a branched cover to its branch locus

It is useful to reformulate the question in its natural differential topology setting, leaving unneeded geometric considerations aside. It is also natural to consider the analog of the problem in all …
Allan Edmonds's user avatar