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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'.
Gist of Idea
What experience could prove 'If a=c and b=c then a=b'?
Source
René Descartes (Comments on a Certain Broadsheet [1644], p.366)
Book Ref
'The Philosophy of Mind', ed/tr. Beakley,B /Ludlow P [MIT 1992], p.366