Haefliger's codimension-one singular foliations, open books and twisted open books in dimension 3

Details Haefliger's codimension-one singular foliations, open books and twisted open books in dimension 3 Haefliger's codimension-one singular foliations, open books and twisted open books in dimension 3

2011-08-13

arxiv.org/abs/1108.2765v1

Mathematics

Geometric Topology

Scientific paper

We consider singular foliations of codimension one on 3-manifolds, in the sense defined by A. Haefliger as being Gamma_1-structures. We prove that under the obvious linear embedding condition, they are Gamma_1-homotopic to a regular foliation carried by an open book or a twisted open book. The latter concept is introduced for this aim. Our result holds true in every regularity C^r, r at least 1. In particular, in dimension 3, this gives a very simple proof of Thurston's 1976 regularization theorem without using Mather's homology equivalence.

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