LessonsProof: Syllogism, Induction, Analogy and the Four FiguresQuiz

كل إنسان حيوان، وبعض الكاتب إنسان.
Every human is an animal, and some writers are human.

Minor premise: Every human is an animal.
Major premise: Some writers are human.
Conclusion: Some animals are writers.

In the conclusion, animal is the minor term and writer the major term. Hence the premise about animals is minor and the premise about writers is major. The middle, human, is subject of the minor and predicate of the major: exactly the fourth figure.

If one instead concludes “Some writers are animals,” the minor and major terms are re-assigned and the same material can be arranged as a first-figure syllogism. The stated conclusion matters when assigning figure.

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Fourth figure: middle minor subject

Proof: Syllogism, Induction, Analogy and the Four Figures

كل إنسان حيوان، وبعض الكاتب إنسان.
Every human is an animal, and some writers are human.

Minor premise: Every human is an animal.
Major premise: Some writers are human.
Conclusion: Some animals are writers.

In the conclusion, animal is the minor term and writer the major term. Hence the premise about animals is minor and the premise about writers is major. The middle, human, is subject of the minor and predicate of the major: exactly the fourth figure.

If one instead concludes “Some writers are animals,” the minor and major terms are re-assigned and the same material can be arranged as a first-figure syllogism. The stated conclusion matters when assigning figure.