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logic - Do we assume an existence of a particular object when using the universal quantifier? - Mathematics Stack Exchange
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logic - Relations between statements involving universal quantifier, conditional and biconditional - Mathematics Stack Exchange
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Section 1.5 and 1.6 Predicates and Quantifiers. Vocabulary Predicate Domain Universal Quantifier Existential Quantifier Counterexample Free variable Bound. - ppt download
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Ch 1.3: Quantifiers Open sentences, or predicates, are sentences that contain one or more variables. They do not have a truth value until variables are. - ppt download
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