French theologian, philosopher, and logician who was the leading Jansenist controversialist and co-authored the Port-Royal Logic — one of the most influential logic textbooks of the 17th century.
The Port-Royal Logic: a comprehensive logic text combining Aristotelian syllogistic with Cartesian epistemology; introduced the distinction between comprehension and extension of terms. Defended Jansenist theology against the Jesuits and challenged Malebranche's account of ideas.
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