Topological (\prod^ω\ell_2, \sum^ω\ell_2)-factors of diffeomorphism groups of non-compact manifolds

Details Topological (\prod^ω\ell_2, \sum^ω\ell_2)-factors of diffeomorphism groups of non-compact manifolds Topological (\prod^ω\ell_2, \sum^ω\ell_2)-factors of diffeomorphism groups of non-compact manifolds

2010-03-15

arxiv.org/abs/1003.2833v1

Mathematics

Geometric Topology

21 pages

Scientific paper

Suppose M is a non-compact connected smooth n-manifold. Let D(M) denote the group of diffeomorphisms of M endowed with the compact-open C^\infty-topology and D^c(M) denote the subgroup consisting of diffeomorphisms of M with compact support. Let D(M)_0 and D^c(M)_0 be the connected components of id_M in D(M) and D^c(M) respectively. In this paper we show that the pair (D(M), D^c(M)) admits a topological (\prod^\omega \ell_2, \sum^\omega \ell_2)-factor. In the case n = 2, this enables us to apply the characterization of (\prod^\omega \ell_2, \sum^\omega \ell_2)-manifolds and show that the pair (D(M)_0, D^c(M)_0) is a (\prod^\omega \ell_2, \sum^\omega \ell_2)-manifold and determine its topological type. We also obtain a similar result for groups of homeomorphisms of non-compact topological 2-manifolds.

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