Displaying similar documents to “Some combinatorial properties of complete semi-Thue systems.”

Every Lusin set is undetermined in the point-open game

Ireneusz Recław (1994)

Fundamenta Mathematicae

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We show that some classes of small sets are topological versions of some combinatorial properties. We also give a characterization of spaces for which White has a winning strategy in the point-open game. We show that every Lusin set is undetermined, which solves a problem of Galvin.

A dichotomy theorem for mono-unary algebras

Su Gao (2000)

Fundamenta Mathematicae

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We study the isomorphism relation of invariant Borel classes of countable mono-unary algebras and prove a strong dichotomy theorem.