The Roelcke compactification of groups of homeomorphisms

Details The Roelcke compactification of groups of homeomorphisms The Roelcke compactification of groups of homeomorphisms

2000-04-21

arxiv.org/abs/math/0004140v1

Mathematics

General Topology

9 pages. To appear in Topology Appl

Scientific paper

Let X be a zero-dimensional compact space such that all non-empty clopen subsets of X are homeomorphic to each other, and let H(X) be the group of all self-homeomorphisms of X with the compact-open topology. We prove that the Roelcke compactification of H(X) can be identified with the semigroup of all closed relations on X whose domain and range are equal to X. We use this to prove that the group H(X) is topologically simple and minimal, in the sense that it does not admit a strictly coarser Hausdorff group topology.

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