Mathematics – Geometric Topology
Scientific paper
2009-11-25
Ergodic Theory and Dynamical Systems, 31 (2011), 1835-1847
Mathematics
Geometric Topology
This version corrects an error regarding the diffeomorphism groups of R^1, since the line has two ends, in contrast to higher
Scientific paper
10.1017/S0143385710000659
We determine all the normal subgroups of the group of C^r diffeomorphisms of R^n, r = 1,2,...,infinity, except when r=n+1 or n=4, and also of the group of homeomorphisms of R^n (r=0). We also study the group A_0 of diffeomorphisms of an open manifold M that are isotopic to the identity. If M is the interior of a compact manifold with nonempty boundary, then the quotient of A_0 by the normal subgroup of diffeomorphisms that coincide with the identity near to a given end e of M is simple.
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