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    An argument that assumes its own conclusion is viciously ... — Carmelics
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    Challenges→Putnam's argument against the brain-in-a-vat hypothesis is viciously circular

    An argument that assumes its own conclusion is viciously circular

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    Premise (ii) is only available if Putnam is not a brain-in-a-vatPutnam's argument against the brain-in-a-vat hypothesis is viciously circularPutnam's argument is intended to prove that he is not a brain-in-a-vatPutnam's argument requires premise (ii) to be available to him

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    An argument that assumes its conclusion in its premises is viciously c...97%An argument that requires the very conclusion it is meant to establish...86%Rule-circular arguments are not necessarily viciously circular85%Descartes' broader argument in the Third Meditation is viciously circu...84%

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    … in taking premiss (ii) to be available to him, Putnam is in effect assuming that he is not a brain-in-a-vat. Since that is just what he is trying to prove, his argument is viciously circular. (2000: 186; his italics)

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