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It was this series of "thoughts" which constituted Descartes' "mind," but his mind was no more a separate entity than the population of New York is a separate entity over and above the several inhabitants. Instead of saying "Descartes thinks," we ought to say "Descartes is a series of which the members are thoughts." And instead of "therefore Descartes exists," we ought to say "Since 'Descartes' is the name of this series, it follows that 'Descartes' is a name.
Source: Bertrand Russell : Mind and Matter (1950年11月？)
More info.: https://russell-j.com/beginner/19501110_Mind-Matter040.HTM