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    Any proposition whose warrant presupposes the falsity of ... — Carmelics
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    Supports→The proposition that one has hands cannot itself serve as evidence for the proposition that one is not a handless brain in a vat

    Any proposition whose warrant presupposes the falsity of hypothesis H cannot serve as independent evidence against H, since the evidential chain is viciously circular rather than genuinely supportive.

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    Key Terms

    Evidence(Distinguished from prior/intrinsic probability in the context of the low priors argument)
    Factors extrinsic to a hypothesis that raise or lower its probability
    Independent evidence(what the author says is missing for the proposed cleavage)
    Proof or support that stands on its own, not depending on assumptions or other claims we haven't verified yet.
    Vicious circularity (circular reasoning)(as used in logic and identifying bad arguments)
    A logical trap where you use a claim to prove itself—like saying 'X is true because X is true'—instead of giving real support.
    hypothesis(Phase three of Dewey's pattern of inquiry)
    A construction that imaginatively utilizes both theoretical ideas and perceptual facts to forecast the possible consequences of various operations

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    proposition(Used in the context of a semantic theory sensitive to differences in subject matter.)
    The content expressed by a sentence, individuated at least in part by the subject matter of the sentence and the contents of its subsentential expressions.
    warrant(Toulmin's model of argumentation)
    An implicit premise that an argument depends on, which licenses the move from evidence to conclusion; in this context, the unstated assumption that normal misdemeanor penalties are insufficient as a deterrent.

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    The proposition that one has hands cannot itself serve as evidence for the propo...

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