Ancient logic: Quick Facts

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Plato conversing with his pupils

Painting by Rembrandt showing Aristotle in rich dark clothing with a gold chain, resting his hand thoughtfully on a marble bust of Homer, illuminated against a dark background.

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Aristotelianism Stoicism Megarian school Logic History of logic Medieval logic Formal logic Applied logic Metalogic Modern logic Philosophy of logic fuzzy logic Predicate calculus Law of nature