The Summa Logicae ("Sum of Logic") is a textbook on logic by William of Ockham. It was written around 1323.
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Systematically, it resembles other works of medieval logic, organised under the basic headings of the Aristotelian Predicables, Categories, terms, propositions, and syllogisms. These headings, though often given in a different order, represent the basic arrangement of scholastic works on logic.
This work is important in that it contains the main account of Ockham's nominalism, a position related to the problem of universals.