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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