The Four Standard Forms
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Every categorical statement reduces to one of four forms: A (All S are P), E (No S are P), I (Some S are P), O (Some S are not P).
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The letters come from Latin: AffIrmo, nEgO — I affirm, I deny.
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Four forms carry the entire system. Everything in this unit is bookkeeping on these.