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  1. Informal Logic’s Infinite Regress: Inference Through a Looking-Glass.Gilbert Edward Plumer - 2018 - In Steve Oswald & Didier Maillat (eds.), Argumentation and Inference. Proceedings of the 2nd European Conference on Argumentation, Fribourg 2017. pp. 365-377.
    [Winner of the 2017 AILACT Essay Prize Prize.] I argue against the skeptical epistemological view exemplified by the Groarkes that “all theories of informal argument must face the regress problem.” It is true that in our theoretical representations of reasoning, infinite regresses of self-justification regularly and inadvertently arise with respect to each of the RSA criteria for argument cogency (the premises are to be relevant, sufficient, and acceptable). But they arise needlessly, by confusing an RSA criterion with argument content, usually (...)
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  • Informal Logic’s Infinite Regress: Inference Through a Looking-Glass.Gilbert Edward Plumer - 2018 - In Steve Oswald (ed.), Argumentation and Inference. Proceedings of the 2nd European Conference on Argumentation, Fribourg 2017. pp. 365-377.
    [Winner of the 2017 AILACT Essay Prize Prize.] I argue against the skeptical epistemological view exemplified by the Groarkes that “all theories of informal argument must face the regress problem.” It is true that in our theoretical representations of reasoning, infinite regresses of self-justification regularly and inadvertently arise with respect to each of the RSA criteria for argument cogency (the premises are to be relevant, sufficient, and acceptable). But they arise needlessly, by confusing an RSA criterion with argument content, usually (...)
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  • Presumptions, Assumptions, and Presuppositions of Ordinary Arguments.Gilbert Plumer - 2017 - Argumentation 31 (3):469-484.
    Although in some contexts the notions of an ordinary argument’s presumption, assumption, and presupposition appear to merge into the one concept of an implicit premise, there are important differences between these three notions. It is argued that assumption and presupposition, but not presumption, are basic logical notions. A presupposition of an argument is best understood as pertaining to a propositional element (a premise or the conclusion) e of the argument, such that the presupposition is a necessary condition for the truth (...)
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