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In formal logic, quantification refers to the process of expressing the extent to which a predicate is true over a range of individuals within a domain. Quantification allows us to make generalized statements using variables and quantifiers. The two primary types of quantifiers in predicate logic are the universal quantifier (∀) and the existential quantifier (∃). These are integral to predicate logic because they extend propositional logic by allowing statements about *all* members of a domain or about the *existence* of at least one member. The rule of quantification refers to the logical principles and rules used to manipulate quantified statements within formal proofs. There are introduction and elimination rules for each quantifier which enable us to derive or use logical statements involving quantifiers. The four main rules are: 1. Universal Elimination (∀ Elim) 2. Existential Introduction (∃ Intro) 3. Universal Introduction (∀ Intro) 4. Existential Elimination (∃ Elim) Each of these rules plays a key role in reasoning and deduction. 1. Universal Elimination (∀ Elim): Also called universal instantiation, this rule allows us to infer that if something is true for all elements in a domain, then it is true for any specific element in that domain. Rule Form: From ∀x P(x), infer P(a) Where 'a' is a specific object in the domain. Example: Premise: ∀x (x > 0 ______ __________ _______ ________ ___ ______ ________ ______.
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