Logic, or the Art of Thinking (Classic Reprint): Being the Port-Royal Logic

by Antoine Arnauld

Master practical reasoning with a classic port-Royal logic guide This edition illuminates how ideas are formed, how affirmation ties subject and attribute, and how propositions are converted without changing truth. It blends clear rules with concrete examples to sharpen argument, judgment, and everyday thinking.

The book surveys how we divide and define ideas, how to respect the limits of language, and how to apply logical principles to moral and practical questions. It covers why some arguments are stronger when they keep ideas within proper bounds, and it shows how to reason about probability and future events with caution and clarity.


How affirmation places an attribute in a subject and what that means for meaning and extension
Rules and nuances of converting affirmative propositions, including universal and particular cases
Practical guidance on judging future events and balancing risk with probability
Illustrative examples that connect logic to everyday decisions and moral reasoning


Ideal for readers of philosophy, logic, or anyone seeking firmer thinking and clearer argumentation.

Genres: Philosophy, Logic, Nonfiction, Linguistics, France

412 pages, Paperback

First published January 1, 1662

About the author

Jansenist theologian and Cartesian philosopher Antoine Arnauld of France co-authored the Port-Royale Logic (1662) with Pierre Nicole.

Adherents of movement of Cornelis Jansen included Antoine Arnauld.

Contemporaries nicknamed this priest and mathematician of the leaders as the grand to distinguish him from his father.

https://en.wikipedia.org/wiki/Antoine...

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