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    Even granting the mode-substance hierarchy, Descartes def... — Carmelics
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    Supports→Treating motion and body as equally fundamental rather than deriving one from the other cannot fully resolve the circularity in Descartes' definitions.

    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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    Reasons For

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    Reason for
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    • 1.Descartes defines extension at Pr II 25 via divisibility and parts capable of spatial rearrangement, not static dimensionality alone.
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    • 2.Defining parts as 'capable of relative displacement' logically presupposes the concept of motion or potential motion in the definition itself.
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    • 3.If motion is allegedly a mode of extension, not constitutive of it, then smuggling motion into extension's definition creates circular reasoning.
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    Reasons Against

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    • 1.Capacity for displacement describes geometric possibility (non-actual potential), which differs fundamentally from actual motion as a mode.
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    • 2.Extension's divisibility into parts is a static structural feature; possibility of rearrangement doesn't require motion to be present or presupposed.
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    • 3.Descartes distinguishes extension's essence (three-dimensional divisibility) from motion's essence (change of place), avoiding actual circularity.
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    Key Terms

    Descartes
    # Descartes René Descartes was a French philosopher and mathematician from the 1600s who fundamentally changed how people think about knowledge and the mind. He's famous for the idea "I think, therefore I am" (cogito ergo sum), which means that the very fact that you can think proves you exist—a foundation for modern philosophy. He also invented the coordinate system used in mathematics (the x and y axes on a graph), which connects geometry and algebra in practical ways we still use today.
    Pr II 25(citation showing where this idea appears in Descartes' writings)
    A reference to a specific part of Descartes' famous book 'Principles of Philosophy,' Part 2, section 25—like a page number for a particular argument he made.
    extension(Semantics and philosophy of language)
    Another term for reference, i.e., the object or set of objects a term picks out
    mode-substance hierarchy(a philosophical framework Descartes uses)
    A way of organizing reality where 'substances' are the fundamental things that exist, and 'modes' are the properties or qualities those things have—like how a physical object (substance) can have a shape or color (modes).
    relative displacement(used in defining what extension is)
    When one thing moves in relation to another thing—like how a ball moves relative to the ground, or one car moves relative to another car.

    Connections

    2 topics

    Truth & Knowledge1 linkedPhilosophy of Language1 linked

    Related

    Capacity for displacement describes geometric possibility (non-actual potential)...Defining parts as 'capable of relative displacement' logically presupposes the c...

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    2 (1 for, 1 against)
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    Descartes defines extension at Pr II 25 via divisibility and parts capable of sp...
    Descartes distinguishes extension's essence (three-dimensional divisibility) fro...
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    Extension's divisibility into parts is a static structural feature; possibility ...If motion is allegedly a mode of extension, not constitutive of it, then smuggli...Treating motion and body as equally fundamental rather than deriving one from th...