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Danny Calegari: Taut foliations leafwise branch cover the 2-sphere (RLGTS, 12 May 2020)

Leertaste = Abspielen/Pausieren
m = Stumm
f = Vollbild
Pfeil-links = Zurückspulen
Pfeil-rechts = Vorspulen
Lukas Lewark

Danny Calegari: Taut foliations leafwise branch cover the 2-sphere (RLGTS, 12 May 2020)

Abstract:

A co-oriented foliation of an oriented 3-manifold is taut if and only if there is a map from the 3-manifold to the 2-sphere which is a branched cover when restricted to each leaf. I shall give two proofs of this theorem and explain its relation to theorems of Ghys and Donaldson.

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