Property of Baire
Difference of an open set by a meager set / From Wikipedia, the free encyclopedia
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A subset of a topological space
has the property of Baire (Baire property, named after René-Louis Baire), or is called an almost open set, if it differs from an open set by a meager set; that is, if there is an open set
such that
is meager (where
denotes the symmetric difference).[1]