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In set theory, the union (denoted by ∪) of a collection of sets is the set of all elements in the collection. [1] It is one of the fundamental operations through which sets can be combined and related to each other. A nullary union refers to a union of zero ( ) sets and it is by definition equal to the empty set.
The algebra of sets is the set-theoretic analogue of the algebra of numbers. Just as arithmetic addition and multiplication are associative and commutative, so are set union and intersection; just as the arithmetic relation "less than or equal" is reflexive, antisymmetric and transitive, so is the set relation of "subset".
:= means "from now on, is defined to be another name for ." This is a statement in the metalanguage, not the object language. This is a statement in the metalanguage, not the object language. The notation a ≡ b {\displaystyle a\equiv b} may occasionally be seen in physics, meaning the same as a := b {\displaystyle a:=b} .
Venn diagram of . In logic, mathematics and linguistics, and is the truth-functional operator of conjunction or logical conjunction.The logical connective of this operator is typically represented as [1] or & or (prefix) or or [2] in which is the most modern and widely used.
The membership of an element of a union set in set theory is defined in terms of a logical disjunction: () (). Because of this, logical disjunction satisfies many of the same identities as set-theoretic union, such as associativity , commutativity , distributivity , and de Morgan's laws , identifying logical conjunction with set intersection ...
Union commonly refers to: Trade union, an organization of workers; Union (set theory), in mathematics, a fundamental operation on sets; Union may also refer to:
This also means that the disjoint union is the categorical dual of the Cartesian product construction. See Coproduct for more details. For many purposes, the particular choice of auxiliary index is unimportant, and in a simplifying abuse of notation , the indexed family can be treated simply as a collection of sets.
De Morgan's laws represented with Venn diagrams.In each case, the resultant set is the set of all points in any shade of blue. In propositional logic and Boolean algebra, De Morgan's laws, [1] [2] [3] also known as De Morgan's theorem, [4] are a pair of transformation rules that are both valid rules of inference.