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    Carmelics

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    Home/Original/inverse
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    Inverse View

    It is not the case that Peter of Spain's doctrine of supposition entails that 'every donkey is a man' makes a positive existential commitment that 'only a man is a donkey' does not share.

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

    Reasons For

    1 perspective
    Reason for
    ?
    • 1.'Only a man is a donkey' presupposes the existence of at least one donkey to be truly evaluated, contrary to the claim.
      ?

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    • 2.Peter of Spain's own formulations do not consistently distinguish existential commitments along the affirmative/negative divide in this way.
      ?

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    • 3.Both statements can be analyzed as having equivalent existential commitments depending on how one interprets universal quantification.
      ?

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    Reasons Against

    1 perspective
    Reason against
    ?
    • 1.In supposition theory, a universal affirmative ('every donkey is a man') requires the subject term to supposit for actually existing things.
      ?

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    • 2.A particular negative ('only a man is a donkey') can be true even if no donkeys exist, since it merely denies a universal claim.
      ?

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    • 3.The asymmetry between affirmative and negative propositions entails different existential presuppositions in medieval logic.
      ?

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