Combining Philosophers
Ideas for Melvin Fitting, George Boolos and Gottfried Leibniz
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5. Theory of Logic / D. Assumptions for Logic / 3. Contradiction
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Falsehood involves a contradiction, and truth is contradictory of falsehood [Leibniz]
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5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic
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Identity is clearly a logical concept, and greatly enhances predicate calculus [Boolos]
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