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    Putnam's argument is intended to prove that he is not a b... — Carmelics
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    Challenges→Putnam's argument against the brain-in-a-vat hypothesis is viciously circular

    Putnam's argument is intended to prove that he is not a brain-in-a-vat

    Philosophy of LanguageSkepticism
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    Related propositions within the same area of thought.
    An argument that assumes its own conclusion is viciously circularPremise (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 requires premise (ii) to be available to him

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    Putnam's argument, as presented, fails to establish that we are not br...90%What Putnam's argument actually establishes is that a brain in a vat's...90%An argument against the brain-in-a-vat hypothesis that presupposes the...88%If the speaker is a brain-in-a-vat, then (T) gives the truth condition...84%

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    SEP: skepticism-content-externalism
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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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