LessonsThe Fourth Figure: Productive Conditions, Moods and ProofsQuiz

وضروبه الناتجة ثمانية بالخلف، وبعكس الترتيب، ثم النتيجة، أو بعكس المقدمتين.
The text lists eight productive arrangements and refers to proof by reductio, reversing the order and converting the result, or converting the premises.

The table on printed page 79 combines four possible quantities/qualities for each premise into 16 cells. Eight cells contain a displayed result; the others are marked as failures of production.

To interpret the table critically, always identify which terms occur in the desired conclusion and in which direction. A result written with its subject and predicate interchanged is not automatically the same claim.

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Reading the source’s eight marked cases

The Fourth Figure: Productive Conditions, Moods and Proofs

وضروبه الناتجة ثمانية بالخلف، وبعكس الترتيب، ثم النتيجة، أو بعكس المقدمتين.
The text lists eight productive arrangements and refers to proof by reductio, reversing the order and converting the result, or converting the premises.

The table on printed page 79 combines four possible quantities/qualities for each premise into 16 cells. Eight cells contain a displayed result; the others are marked as failures of production.

To interpret the table critically, always identify which terms occur in the desired conclusion and in which direction. A result written with its subject and predicate interchanged is not automatically the same claim.