He also addresses style , diction, metaphor , and arrangement , but he basically ignores the other canons of rhetoric. This work was the first psychological rhetoric ever presented. The theory of the syllogism was first introduced by Aristotle. He was the first to analyze an argument in a logical order. The generic syllogism is if A belongs to all B, and B belongs to all C, then A belongs to all C. A syllogism can either be dialectical or rhetorical.
Dialectical syllogisms are always true.
Rhetorical syllogisms are probably true, but not always true. The rhetorical syllogism is also called an enthymeme. The enthymeme has a missing part that must be filled in by the audience. Syllogism and enthymeme are very closely related. Another concept, pisteis, was developed by Aristotle.