Indefinite Morse 2-functions; broken fibrations and generalizations

Details Indefinite Morse 2-functions; broken fibrations and generalizations Indefinite Morse 2-functions; broken fibrations and generalizations

2011-02-03

arxiv.org/abs/1102.0750v2

Mathematics

Geometric Topology

64 pages, 34 figures; added reference in Section 1

Scientific paper

A Morse 2-function is a generic smooth map from a smooth manifold to a surface. In the absence of definite folds (in which case we say that the Morse 2-function is indefinite), these are natural generalizations of broken (Lefschetz) fibrations. We prove existence and uniqueness results for indefinite Morse 2-functions mapping to arbitrary compact, oriented surfaces. "Uniqueness" means there is a set of moves which are sufficient to go between two homotopic indefinite Morse 2-functions while remaining indefinite throughout. We extend the existence and uniqueness results to indefinite, Morse 2-functions with connected fibers.

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