Part III, Chapter 3: General Rules of Simple Incomplex Syllogisms

Antoine Arnauld (1612-1694) and Pierre Nicole · Logic, or the Art of Thinking

Section 4 of 6

Some errors in this text were corrected by AI.

Rule 4

A negative conclusion cannot be proved by two affirmative propositions.

For from the fact that the two terms of the conclusion are united with the third, it cannot be proved that they are separated from each other.