An explanation of Gottlob Frege’s solutions to Frege’s Puzzle and the problem of propositional attitude reports using Frege’s theory of Sense and Reference.

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An explication of Gottlob Frege’s puzzle for the principle of the transitivity of identity also known as the principle of identity substitution.

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A description of the relation identity and how it is used in Predicate Calculus (100 Days of Logic).

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