Invariance des classes de Godbillon-Vey par C 1-difféomorphismes. (Invariance of Goodbillon-Vey classes by C 1-diffeomorphisms). (French) Zbl 0596.57018

We show that the Godbillon-Vey classes of codimension-one foliations of class \(C^ 2\) are invariant under \(C^ 1\)-diffeomorphisms.


57R30 Foliations in differential topology; geometric theory
57R32 Classifying spaces for foliations; Gelfand-Fuks cohomology
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