WE must first state the subject of our inquiry and the faculty to which it belongs: its subject is demonstration and the faculty that carries it out demonstrative science. We must next define a premiss, a term, and a syllogism, and the nature of a perfect and of an imperfect syllogism; and after that, the inclusion or noninclusion of one term in another as in a whole, and what we mean by predicating one term of all, or none, of another.
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nationmaster - Encyclopedia: Syllogism
In his Prior Analytics, Aristotle defines syllogism as: "a discourse in which, certain things ... Prior Analytics is Aristotles work on deductive reasoning, ...
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