| 11. | Existential quantifiers are dealt with by Skolemization.
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| 12. | The equivalence provides a way for " moving " an existential quantifier before a universal one.
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| 13. | This gives us the existential quantifier.
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| 14. | To do so, one can use second-order existential quantifiers to arbitrarily choose a computation tableau.
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| 15. | The " let " expression may be considered as a existential quantifier which restricts the scope of the variable.
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| 16. | The term " quantifier variance " rests upon the philosophical term'quantifier', more precisely existential quantifier.
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| 17. | Tableaux are extended to first order predicate logic by two rules for dealing with universal and existential quantifiers, respectively.
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| 18. | For a concrete example, take the universal and existential quantifiers & forall; and & exist;, respectively.
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| 19. | Indefinites must sometimes be interpreted as existential quantifiers, and other times as universal quantifiers, without any apparent regularity.
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| 20. | In such a logic, one can regard the existential quantifier, for instance, as derived from an infinitary disjunction.
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