In On Interpretation Aristotle turns from terms to propositions, which are sentences that contain either truth or falsity. Propositions assert judgments about concepts; for Aristotle, concepts are the likenesses of things, as experienced by a given person, in contrast to objective reality. A proposition attempts to combine or separate concepts, and it is to be considered true when its combination or separation corresponds to a combination or separation of the things it represents. This recognition of language as a signifier therefore provides the basis for an understanding of what truth and falsity mean.With Prior Analytics Aristotle made his most important contribution to logic: the syllogism. A syllogism consists of certain assumptions or premises from which a conclusion can be deduced. Aristotle referred to the terms as the "extremes" and the
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