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    Peter of Spain's doctrine of supposition entails that 'ev... — Carmelics
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    Challenges→Every donkey is a man

    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.

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    1 reason for
    1 reason against

    Reasons For

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    Reason for
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    • 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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    Reasons Against

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    Reason against
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    • 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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    Related

    'Only a man is a donkey' presupposes the existence of at least one donkey to be ...A particular negative ('only a man is a donkey') can be true even if no donkeys ...Both statements can be analyzed as having equivalent existential commitments dep...Every donkey is a man
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    In supposition theory, a universal affirmative ('every donkey is a man') require...Peter of Spain's own formulations do not consistently distinguish existential co...The asymmetry between affirmative and negative propositions entails different ex...

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    claim
    Perspectives
    2 (1 for, 1 against)
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    1 edit