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Ideas for 'fragments/reports', 'Reference and Essence: seven appendices' and 'Posterior Analytics'

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5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence

12373	Something holds universally when it is proved of an arbitrary and primitive case [Aristotle]
	Full Idea: Something holds universally when it is proved of an arbitrary and primitive case.
	From: Aristotle (Posterior Analytics [c.327 BCE], 73b33)
	A reaction: A key idea in mathematical logic, but it always puzzles me. If you snatch a random person in London, and they are extremely tall, does that prove that people of London are extremely tall? How do we know the arbitrary is representative?