Union
The union used in set theory is defined in terms of a logical disjunction: x ∈ A ∪ B if and only if (x ∈ A) ∨ (x ∈ B). 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.
Read more about this topic: Logical Disjunction
Famous quotes containing the word union:
“Visitors who come from the Soviet Union and tell you how marvellous it is to be able to look at public buildings without advertisements stuck all over them are just telling you that they can’t decipher the cyrillic alphabet.”
—Clive James (b. 1939)
“I not only rejoice, but congratulate my beloved country Texas is reannexed, and the safety, prosperity, and the greatest interest of the whole Union is secured by this ... great and important national act.”
—Andrew Jackson (1767–1845)
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—Richard M. Nixon (1913–1995)