Cuiuslibet hominis asinus currit

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Every man's donkey runs - Anonymous Worcester 13 ff.32va-33vb

Cuiuslibet hominis asinus currit

Every man's donkey is running. Suppose that every man has two donkeys, one running and one not running. Then every man's donkey is running, for the donkey of this man runs, the donkey of that man runs, and so on for each individual man. But on the other hand, a donkey of this man does not run, (namely the other one of his which is not running), a donkey of that man does not run, and so on for each individual man. Therefore every man's donkey is not running. Therefore it is not the case that every man's donkey is running.

See also

Heytesbury's version of the sophism

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