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universal affirmative

American  

noun

Logic.
  1. a proposition of the form “All S is P.” A, a


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Consider the following universal affirmative statement: “All games involve a winner and a loser.”

From Textbooks Jun. 15, 2022

The reason why a universal affirmative, which is of course infinitely the most important form of proposition, can only be proved in the first figure may be seen as follows.

From Deductive Logic by St. George William Joseph Stock

It suffices to prove every kind of conclusion, and is the only figure in which a universal affirmative proposition can be established.

From Deductive Logic by St. George William Joseph Stock

Therefore, writing x for 'devils,' y for 'ugly,' and ȳ for 'not-ugly,' we may express A., the universal affirmative, thus: A. xȳ = 0.

From Logic Deductive and Inductive by Carveth Read

The first of the eleven moods, AAA, is excluded by the rule that the conclusion cannot be a universal affirmative.

From Deductive Logic by St. George William Joseph Stock

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