On démontre que pour chaque entier il existe un voisinage ouvert de l’application identité de la 2-sphère, pour la topologie, tel que : si est un sous-groupe nilpotent à longueur de nilpotence , engendré par une famille quelconque d’éléments de , alors l’action naturelle de sur a un point fixe. De plus, en présence d’une orbite finie cette action a au moins deux points fixes.
We prove that for each integer there is an open neighborhood of the identity map of the 2-sphere , in topology such that: if is a nilpotent subgroup of with length of nilpotency, generated by elements in , then the natural -action on has nonempty fixed point set. Moreover, the -action has at least two fixed points if the action has a finite nontrivial orbit.
@article{AIF_2002__52_4_1075_0, author = {Druck, Suely and Fang, Fuquan and Firmo, Sebasti\~ao}, title = {Fixed points of discrete nilpotent group actions on $S^2$}, journal = {Annales de l'Institut Fourier}, volume = {52}, year = {2002}, pages = {1075-1091}, doi = {10.5802/aif.1912}, mrnumber = {1926674}, zbl = {1005.37019}, language = {en}, url = {http://dml.mathdoc.fr/item/AIF_2002__52_4_1075_0} }
Druck, Suely; Fang, Fuquan; Firmo, Sebastião. Fixed points of discrete nilpotent group actions on $S^2$. Annales de l'Institut Fourier, Tome 52 (2002) pp. 1075-1091. doi : 10.5802/aif.1912. http://gdmltest.u-ga.fr/item/AIF_2002__52_4_1075_0/
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