PHIL 213 Class notes, Week 1, Lecture 1

Logic: Aristotelian Syllogism versus Non-linear or Four-step Logic (Sanskrit: Catus-koti)

Aristotelian, propositional (term) logic:
All Greeks are men
All men are mortal
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All Greeks are mortal

Tetralemma or Four-step Logic; Catus-koti:
A exists
A doesn't exist
A both exists and doesn't exist
A neither exists nor doesn't exist
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No final propositional conclusion