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    Carmelics

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    Home/Original/inverse
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    Inverse View

    It is not the case that Aristotle's argument that the heavens are composed of a naturally ungenerable and imperishable fifth body is not validly deduced from the fact that the heavens have circular movement.

    ?Set your confidence on the premises below to see your aggregate.

    Reasons For

    1 perspective
    Reason for
    ?
    • 1.Aristotle's argument requires the premise that all simple movements belong to simple bodies.
      ?

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    • 2.Aristotle only secured the premise that all simple bodies have simple movements, not its converse.
      ?

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    Reasons Against

    2 perspectives
    Reason against 1 of 2
    ?
    • 1.Aristotle's inference from circular motion to a unique fifth element commits the fallacy of affirming the consequent: from 'if fifth element, then circular motion' to 'if circular motion, then fifth element'.
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    • 2.Modal logic requires that valid deductions preserve necessity: contingent kinematic observations cannot ground claims about the essential, imperishable nature of a substance.
      ?

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    • 3.Philoponus demonstrated in 'Against Aristotle on the Eternity of the World' that circular motion is compatible with generated, perishable bodies, severing the necessary connection Aristotle assumes.
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    Reason against 2 of 2
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    • 1.Aristotle's own hylomorphic framework entails that natural motion is determined by formal and material constitution together, making motion an insufficient sole indicator of unique elemental composition.
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    • 2.The convertibility of 'simple body' and 'simple motion' would require a biconditional grounded in metaphysical necessity, but Aristotle provides only a one-directional causal claim in De Caelo I.2.
      ?

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    • 3.John Philoponus and later Ibn Rushd's critics noted that multiple distinct substances can share kinematic properties, undermining any uniqueness argument from motion alone.
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