Logic / Logic 068 · Atom · ~20 seconds
The Four Standard Forms
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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.