Encyclopedia > Existential quantifier

Article Content

Existential quantifier

An existential quantifier is the symbol ∃ in predicate calculus. It roughly represents the phrase "for some" or "there exists". For example

∃ x (x²=25)

means "there exists an x such that x²=25".

The unique existential quantifer is the symbol ∃!. For example,

∃! x (x-2) = 4

means "there exists an unique x such that x-2 = 4".

History of the Quantifer

TODO

See Existential quantification for details.

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

Ludvika

... is a municipality in central Sweden, in the county of Dalarna. The municipality covers an area of 1500.7 km². Of the total population of 26450, 13112 are male, and ...