INVARIANCE OF THE GODBILLON- VEY CLASS BY C~1-DIFFEOMORPHISMS FOR HIGHER CODIMENSIONAL FOLIATIONS

摘要

G.Raby proved in [4] that the Godbillon-Vey invariant for codimension-one foliations is invariant by C~1-diffeomorphisms.In this paper we generalize the result for foliations of arbitrary codimension.