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单词 existential quantifier
释义 existential quantifier
[´eg·zǝ¦sten·chǝl `kwän·tǝ´fī·ǝr]
MATHEMATICS
A logical relation, often symbolized ∃, that may be expressed by the phrase ``there is a'' or ``there exists''; if P is a predicate, the statement (∃x )P(x ) is true if there exists at least one value of x in the domain of P for which P(x ) is true, and is false otherwise.
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