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    Aristotle's argument that the heavens are composed of a n... — Carmelics
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    Home/Modality & Possibility
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    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.

    CausationModality & Possibility
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    2 reasons for
    1 reason against

    Reasons For

    2 perspectives
    Reason for 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 for 2 of 2
    ?
    • 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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    Reasons Against

    1 perspective
    Reason against
    ?
    • 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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    Modality & PossibilityCausation

    Key Terms

    Aristotle
    Aristotle was an ancient Greek philosopher who lived over 2,000 years ago and is one of the most influential thinkers in Western history. He studied nearly every subject—from animals and plants to politics and ethics—and developed practical ways of thinking that shaped how people understand the world. His ideas on logic, nature, and how to live a good life are still taught and debated today because he focused on observing the real world rather than just abstract theories.
    circular movement(what Aristotle observed about the heavens)
    Motion that goes in a circle or orbit, returning to its starting point; Aristotle observed the heavens moving in circular paths.
    fifth body(what Aristotle claimed the heavens are made of)
    Aristotle's term for a fifth type of material substance in the heavens (beyond earth, water, air, and fire), which he believed was perfect and eternal.
    imperishable(Norris's distinction between indissolvible and imperishable; the soul is indissolvible but not imperishable)
    Incapable of ceasing to exist under any circumstances, including the withdrawal of God's creative activity
    ungenerable(Galen's claim that what is incorruptible is also ungenerable)
    Incapable of being generated or created; having no beginning
    validly deduced(whether Aristotle's reasoning is sound)
    Properly and logically concluded from evidence; when you reach a conclusion that actually follows from the facts you started with.

    Related

    Aristotle only secured the premise that all simple bodies have simple movements,...Aristotle's argument requires the premise that all simple movements belong to si...Aristotle's inference from circular motion to a unique fifth element commits the...Aristotle's own hylomorphic framework entails that natural motion is determined ...
    +4 moreShow less
    John Philoponus and later Ibn Rushd's critics noted that multiple distinct subst...Modal logic requires that valid deductions preserve necessity: contingent kinema...

    Source

    AI-extracted1/3 agreementValid
    SEP: byzantine-philosophy
    View source passageHide passage
    It is typical of Choumnos’ approach that he seeks to argue philosophically, that is by valid inference from principles and definitions that are universally accepted, for views that are already theologically established. Thus he attempts to refute Aristotle’s theory that the heavens are composed of a fifth, naturally ungenerable and imperishable body, not by simply appealing to the Christian doctrine that the world was created at the beginning of time and persists only through the grace of its cr
    Extraction notes

    Validity: Extracted via Max plan + API grounding/validity checks

    Details

    Philoponus demonstrated in 'Against Aristotle on the Eternity of the World' that...
    The convertibility of 'simple body' and 'simple motion' would require a bicondit...

    Similar

    Aristotle's final causality solution is insufficient to explain why th...78%If an immutable fifth element (ether) exists in the celestial region, ...77%Aristotle's assumption that celestial motion has gone on for all etern...75%Aristotle's argument requires the premise that all simple movements be...74%
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    Perspectives
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