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Ideas for 'Lectures on the History of Philosophy', 'fragments/reports' and 'Rules for the Direction of the Mind'

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9. Objects / F. Identity among Objects / 7. Indiscernible Objects

489	Each thing must be in some way unique [Diogenes of Apollonia]
	Full Idea: No one thing among things subject to change can possibly be exactly like any other thing, without becoming the same thing.
	From: Diogenes (Apoll) (fragments/reports [c.440 BCE], B05), quoted by Simplicius - On Aristotle's 'Physics' 153.8
	A reaction: This is said to be the first ever formulation of the principle of identity of indiscernible.