Given any Liouville number alpha, it is shown that various subspaces are C-infinity-dense in the space of the orientation preserving C-infinity diffeomorphisms of the circle with rotation number alpha.
机构:
Univ Lille 1, Lab Paul Painleve, UMR 871, F-59655 Villeneuve Dascq, FranceUniv Lille 1, Lab Paul Painleve, UMR 871, F-59655 Villeneuve Dascq, France