This paper is a modern reformulation of Aristotle's concepts of topos and enthymeme and the relation between them. Briefly, a topos may be understood as a binary relation which replaces implication in the syllogism to yield an enthymeme. If a syllogism is an argument of the form, (1) If P, and P implies Q, then Q, then an enthymeme is an argument of the form, (2) If P, and T(P,Q), then Q. All of Aristotle's twenty-eight topoi in the Rhetoric may be shown to have the form (2), and the enthymeme can thus be understood as a generalized (or weakened) syllogism.
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