Sum of Logic

The Summa Logicae ("Sum of Logic") is a textbook on logic by William of Ockham. It was written around 1323.

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Scholasticism
Schools Thomism Scotism Occamism
Major works Summa Theologica Cur Deus Homo Summa Grammatica Summa logicae Opus Oxoniense Libri Quattuor Sententiarum
Precursors Augustine of Hippo Boethius Pope Gregory I Alcuin of York John Scotus Eriugena
Philosophers Thomas Aquinas ("Doctor Angelicus") Duns Scotus ("Doctor Subtilis") William of Ockham ("Doctor Invincibilis") Francisco Suárez ("Doctor Eximius") Averroes ("The Commentator") Albertus Magnus ("Doctor Universalis") Peter Lombard ("The Master") Bonaventure ("Doctor Seraphicus") Anselm of Canterbury ("Doctor Marianus") Peter Abelard ("Doctor Scholasticus")
Related Philosophy Aristotelianism Dominican Order Franciscan Order Catholic theology Islamic philosophy Empiricism Neoplatonism Neo-scholasticism Problem of universals Protoscholastic writing
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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.