Frege's propositional calculus, developed by Gottlob Frege in the late 19th century, is one of the earliest formal systems in logic. It represents a significant milestone in the development of mathematical logic and formal reasoning. ### Key Features of Frege's Propositional Calculus: 1. **Propositions and Truth Values**: Frege's calculus deals with declarative sentences (propositions) that can be classified as either true or false.
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