Operations on sets

set of the ordered pairs such that the first element of the pair is in the first element of the product and the second element of the pair is in the second element of the product

operation denoted by symbol “∪” applied on two sets; the set of all distinct elements in the collection

concept in set theory (for the term in geometry, see Q1364910)

set (in mathematics) containing all subsets of a given set

unary operation on sets: the set of non-elements of the argument set

mathematical definition in set theory

modified union operation that indexes the elements according to which set they originated in

mathematical identities and relationships involving sets