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Ideas for 'A World of States of Affairs', 'Comments on a Certain Broadsheet' and 'works'

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12. Knowledge Sources / A. A Priori Knowledge / 4. A Priori as Necessities

2602	What experience could prove 'If a=c and b=c then a=b'? [Descartes]
	Full Idea: Please tell me what the corporeal motion is that is capable of forming some common notion to the effect that 'things which are equal to a third thing are equal to each other'.
	From: René Descartes (Comments on a Certain Broadsheet [1644], p.366)