Godbillon-Vey invariants for families of foliations
arXiv:math/0111137
Abstract
The classical Godbillon-Vey invariant is an odd degree cohomology class that is a cobordism invariant of a single foliation. Here we investigate cohomology classes of even degree that are cobordism invariants of (germs of) 1-parameter families of foliations.
17 pages