Zeno really did prove that the quantitative as quantitative (or, the extended as such) cannot be a subject of motion. Either the whole quantity moved, or its parts, and either way is impossible.

Aristotle intensified the problem by showing that everything in motion was extended. Given motion, he concluded that everything in motion was being constituted as a mobile by something else. This is the first sense of Omne quod movetur, etc.


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