Étude des Γ-structures de codimension 1 sur la sphère S 2
Annales de l'Institut Fourier, Tome 23 (1973) no. 4, pp. 213-227.

Cet article contient une démonstration géométrique simple de π 2 (BΓ 1 r )=0 pour r=0,∞.

Ce résultat (démontré aussi par Mather comme corollaire d’un théorème beaucoup plus général) apparaît comme une conséquence du théorème de Michael Herman : Diff S 1 [ Diff S 1 , Diff S 1 ]=0.

L’appendice contient une étude des Γ structures sur les surfaces et un résultat sur la cohomologie de Diff S 1 .

This article contains a simple geometric demonstration of π 2 (BΓ 1 r )=0 for r=0,∞.

This result (which was also proved by Mather as a corollary of a far more general theorem) uses Michael Herman’s theorem: Diff S 1 [ Diff S 1 , Diff S 1 ]=0.

The reader will find in the appendix a study of Γ-structures on surfaces and a result about the cohomology group of Diff S 1 .

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     title = {\'Etude des $\Gamma $-structures de codimension 1 sur la sph\`ere $S^2$},
     journal = {Annales de l'Institut Fourier},
     pages = {213--227},
     publisher = {Institut Fourier},
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Roger, Claude. Étude des $\Gamma $-structures de codimension 1 sur la sphère $S^2$. Annales de l'Institut Fourier, Tome 23 (1973) no. 4, pp. 213-227. doi : 10.5802/aif.488. http://www.numdam.org/articles/10.5802/aif.488/

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[3] Herman, C.R.A.S., 1971.

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