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We prove that for each integer k of at least 2, there is an open neigborhood \nu_k of the identity map of the 2-sphere S^2, in C^1-topology such that: if G is a nilpotent subgroup of Diff^1(S^2) with length k of nilpotency, generated by elements in \
Externí odkaz:
http://arxiv.org/abs/math/0109015
Autor:
Druck, Suely1
Publikováno v:
Parcerias Estratégicas. dez2010, Vol. 15 Issue 31, p175-180. 6p.
Autor:
Druck, Suely, Spira, Michel
Publikováno v:
Mathematics Competitions; Dec2008, Vol. 21 Issue 2, p20-30, 11p