Originally published in 1662, Arnauld and Nicole's manual of logic based on Descartes's Regulae "elaborated the theory of 'clear and distinct' ideas and gives the first account of Pascal's Méthode. It had enormous influence as a textbook until comparatively recent times" (DSB). It became known as the Port-Royal Logic because of the authors' association with the Jansenist Convent of Port-Royal. DSB I, 292; Rieber & Gach 9 (1718 edition).
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