We prove the following: (1) the existence, for every integer n ≥ 4, of a noncompact smooth n-dimensional topological manifold whose diffeomorphism group contains an isomorphic copy of every finitely presented group; (2) a finiteness theorem for finite simple subgroups of diffeomorphism groups of compact smooth topological manifolds.
机构:
Pontificia Univ Catolica Rio de Janeiro, Dept Matemat, BR-22453900 Rio De Janeiro, BrazilPontificia Univ Catolica Rio de Janeiro, Dept Matemat, BR-22453900 Rio De Janeiro, Brazil