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    Quantified formulas in fiction or mathematics need not ha... — Carmelics
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    Challenges→Universal instantiation from '∀x∀y[L(x,y)]' presupposes a fixed, uniform domain, but names like 'Romeo' may fail to rigidly refer to any actual domain element.

    Quantified formulas in fiction or mathematics need not have concrete domains; abstract or fictional domains are valid domains in model-theoretic semantics.

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    Universal instantiation from '∀x∀y[L(x,y)]' presupposes a fixed, uniform domain,...

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    Universal instantiation from '∀x∀y[L(x,y)]' presupposes a fixed, uniform domain,...

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