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Inverse View
It is not the case that Treating motion and body as equally fundamental rather than deriving one from the other cannot fully resolve the circularity in Descartes' definitions.
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Reasons For
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Reason for
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1.
Descartes explicitly deems motion to be a 'mode' of extension, which is a lesser ontological category than extension itself.
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2.
A mode is a way that extension manifests itself, or a property of extension (Pr I 53).
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3.
If motion is ontologically subordinate to extension, then motion and body cannot be treated as equally fundamental notions.
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Reasons Against
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Reason against 1 of 2
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1.
Descartes' own definitions are mutually implicating: body is defined via impenetrability, which presupposes resistance to displacement, which presupposes motion.
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2.
A mode that is necessary for individuating its substance cannot be ontologically subordinate to it without collapsing the distinction between substance and mode.
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3.
This structural co-dependence mirrors what Aristotle identified as pros hen equivocity, where neither term is intelligible without the other, precluding any asymmetric grounding.
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Reason against 2 of 2
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1.
Even granting the mode-substance hierarchy, Descartes defines extension itself through parts capable of relative displacement, smuggling motion back into the definition of extension (Pr II 25).
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2.
When the definiendum of extension covertly invokes motion, the ontological priority of extension over motion becomes circular rather than foundational, as Garber argues in 'Descartes' Metaphysical Physics'.
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