Reduction — Aristotle's Dictum de omni et Nullo and the First Figure

Your class teacher once told you: “Everyone in this section must submit the form.” The moment you know you are in this section, you know the form applies to you — no further argument needed. That one-step certainty is exactly what Aristotle's Dictum captures, and it is the reason Figure I needs no proof of its own validity while every other figure does.

In two minutes

Aristotle's Dictum de omni et nullo says that whatever is affirmed or denied of an entire class can be affirmed or denied of anything contained within that class, and it is this single principle that makes the four moods of Figure I self-evidently valid.

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