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In measure theory, a conull set is a set whose complement is null, i.e., the measure of the complement is zero. For example, the set of irrational numbers is a conull subset of the real line with Lebesgue measure.
A property that is true of the elements of a conull set is said to be true almost everywhere.
Complement graphGraph with same nodes as but complementary connections to another
Corona theorem
Almost everywhereEverywhere except a set of measure zero
Duality (mathematics)General concept and operation in mathematics
Property of BaireDifference of an open set by a meager set
ErgodicityProperty of measure-preserving dynamical systemsText from Wikipedia, CC BY-SA 4.0 · Source article