The Logical Structure Involved in the Two Features Discussed Above

The Logical Structure Involved in the Two Features Discussed Above

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The Logical Structure Involved in the Two Features Discussed Above Feature 1: Substitution of Co-Referential Terms Preserves Truth-Value What is involved here is a matter of the validity of the following inference: Fa a =b Therefore: Fb Feature 2: Existential Generalization, or "Quantifying In", is Truth-Preserving This is a matter of the validity of the following inference: Fa Therefore: (Ex)Fx 1.2.2 Intentional States and Intensional Contexts As the sentences about beliefs illustrate, some sentences attributing mental states to a person involve intensional contexts. This is true not only in the case of beliefs, but also in the case of desires, thoughts, hopes, fears, etc., as the following sentences illustrate: "Tom wants to find a way of squaring a circle " "John thinks that the third planet from the sun is Mars" "Mary hopes that the lost continent of Atlantis will soon be found" "Some Greeks feared Zeus more than any other gods" It is rather natural, then, to relate intentionality to the occurrence of intensional contexts
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The Logical Structure Involved in the Two Features Discussed Above

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