Nous construisons des quasi-morphismes homogènes sur le groupe des difféomorphismes isotopes à l'identité et qui préservent l'aire du tore de dimension 2, dont la restriction au groupe des difféomorphismes supportés dans un disque est égale à l'invariant de Calabi.
We construct homogeneous quasi-morphisms on the identity component of the group of area preserving diffeomorphisms of the two dimensional torus, whose restriction to the subgroup of diffeomorphisms with support in any fixed disc equals Calabi's invariant.
Accepté le :
Publié le :
Pierre Py 1
@article{CRMATH_2006__343_5_323_0, author = {Pierre Py}, title = {Quasi-morphismes de {Calabi} et graphe de {Reeb} sur le tore}, journal = {Comptes Rendus. Math\'ematique}, pages = {323--328}, publisher = {Elsevier}, volume = {343}, number = {5}, year = {2006}, doi = {10.1016/j.crma.2006.07.006}, language = {fr}, }
Pierre Py. Quasi-morphismes de Calabi et graphe de Reeb sur le tore. Comptes Rendus. Mathématique, Volume 343 (2006) no. 5, pp. 323-328. doi : 10.1016/j.crma.2006.07.006. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.1016/j.crma.2006.07.006/
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