### Somewhere trivial automorphisms

by Shelah and Steprans. [ShSr:427]

J London Math Soc, 1994

It is shown to be consistent that there is a
non-trivial autohomeomorphism of beta N while all such
autohomeomorphisms are trivial on some open set. The model used is
one due to Velickovic in which, coincidentally, Martin's Axiom
also holds.

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