In predicate calculus, an existential formula is a prenex normal form formula (i.e., a formula written as a string of quantifiers and bound variables followed by a quantifier-free part) in which the quantified variables are existentially quantified. Every existential formula is logically equivalent to the negation of some universal formula (and vice-versa). When there are no free variables (i.e., when all the variables are bound) in an existential formula, it is called an existential sentence.
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