EntityQ242767· pop 50· linked from 673 articlescomplementSign in to saveunary operation on sets: the set of non-elements of the argument setArticleIn set theory, the complement of a set A, often denoted byARead full article (351 paragraphs)Gallery (3)Connectionssemantic theory of truthEntitymathematical logicEntityCategoriesBasic concepts in set theoryOperations on sets