3 articles
Analytic set
An analytic set is a subset of a Polish space that is the continuous image of a Polish space, or equivalently the projection of a Borel set.
Baire property
The Baire property, also called the property of Baire, is a regularity property of subsets of a topological space: the set differs from an open set only by a meager set.
Descriptive set theory
Descriptive set theory is the branch of mathematical logic that studies definable sets of real numbers and Polish spaces, including Borel, analytic, and coanalytic sets.