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    Challenges→Without a world structure, the concept of relative motion of several bodies has no more foundation than the concept of absolute motion of a single body.

    The parsimony principle favors Mach's ontology: relative motion between bodies is foundational, not derivative of a prior structural framework.

    ?Rate how convincing each reason is below to see the overall strength.
    1 reason for
    1 reason against

    Reasons For

    1 perspective
    Reason for
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    • 1.Absolute space/time require unobservable entities; relative motion needs only observable bodies, reducing ontological commitment.
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    • 2.Physics equations (Newton, Einstein) depend only on relative quantities between objects, not background coordinates.
      ?

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    • 3.Mach's view eliminates the conceptual problem of explaining what absolute space/time exist independently of all physical content.
      ?

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    Reasons Against

    1 perspective
    Reason against
    ?
    • 1.Rotation produces real centrifugal effects distinguishable from inertial motion—suggesting a non-relative inertial frame exists.
      ?

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    • 2.Relative-only ontology struggles to ground the laws of motion themselves without some structural framework to explain regularities.
      ?

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    • 3.Modern spacetime geometry (general relativity) is itself a structural framework; Mach's view merely displaces rather than eliminates it.
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    Causation1 linkedModality & Possibility1 linked

    Related

    Absolute space/time require unobservable entities; relative motion needs only ob...Mach's view eliminates the conceptual problem of explaining what absolute space/...Modern spacetime geometry (general relativity) is itself a structural framework;...Physics equations (Newton, Einstein) depend only on relative quantities between ...
    +3 moreShow less
    Relative-only ontology struggles to ground the laws of motion themselves without...Rotation produces real centrifugal effects distinguishable from inertial motion—...Without a world structure, the concept of relative motion of several bodies has ...

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    2 (1 for, 1 against)
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    The parsimony principle favors Mach's ontology: relative ... — Carmelics