A syllogism or logical appeal is a kind of logical argument in which one proposition (the conclusion) is inferred from two others of a certain form. In Prior Analytics, Aristotle defines syllogism as "a discourse in which, certain things having been supposed, something different from the things supposed results of necessity because these things are so. " (24b18–20) Despite this very general definition, he limits himself first to categorical syllogisms (and later to modal syllogisms).
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syllogism An inference in which one proposition (the conclusion) follows necessarily from two other propositions, known as the premises.