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math.LO2004
The number of translates of a closed nowhere dense set required to cover a Polish group
Arnold W. Miller, Juris Steprans
For a Polish group G let cov_G be the minimal number of translates of a fixed closed nowhere dense subset of G required to cover G. For many locally compact G this cardinal is know…
math.LO2000
Martin's Axiom is Consistent with the Existence of Nowhere Trivial Automorphisms
Saharon Shelah, Juris Steprāns
Martin's Axiom does not imply that all automorphisms of P(N)/[N]^{<aleph_0} are somewhere trivial.