LessonsThe Fourth Figure: Productive Conditions, Moods and ProofsQuiz

Under the first route, the minor premise is universal affirmative; the major is affirmative and may be universal or particular. Every B belongs to C, and the major establishes that A has a positive connection with B.

Example:
All teachers are human.
Some authors are teachers.
Therefore some humans are authors.

The authors witnessed by the particular major are teachers, and every teacher is human. The conclusion follows even though the major is particular.

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Route one: both premises affirmative

The Fourth Figure: Productive Conditions, Moods and Proofs

Under the first route, the minor premise is universal affirmative; the major is affirmative and may be universal or particular. Every B belongs to C, and the major establishes that A has a positive connection with B.

Example:
All teachers are human.
Some authors are teachers.
Therefore some humans are authors.

The authors witnessed by the particular major are teachers, and every teacher is human. The conclusion follows even though the major is particular.