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Necessary Assumptions

Informal Logic 19 (1):41-61 (1999)

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  1. ­A Defense of Analogy Inference as Sui Generis.André Lars Joen Juthe - forthcoming - Logic and Logical Philosophy:1.
    Accounts of analogical inference are usually categorized into four broad groups: abductive, deductive, inductive and sui generis. The purpose of this paper is to defend a sui generis model of analogical inference. It focuses on the sui generis account, as developed by Juthe [2005, 2009, 2015, 2016] and Botting’s [2017] criticism of it. This paper uses the pragmadialectical theory of argumentation as the methodological framework for analyzing and reconstructing argumentation. The paper has two main points. First, that Juthe’s arguments against (...)
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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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  • Commentary on Hoaglund.Wayne Grennan - unknown
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  • Three Recalcitrant Problems of Argument Identification.Michael E. Malone - 2003 - Informal Logic 23 (3):237-261.
    Logicians disagree on (1) criteria for the presence of an argument, (2) criteria for adding implicit premises and (3) criteria for linking premises. I attempt to resolve all three problems, and in the process to remove the main obstacles to teaching diagramming. The first problem is resolved by working with real discourse that students find on their own, rather than the artificial examples and problems found in logic texts; it is further reduced by examining the different uses of argument and (...)
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  • The Paradoxical Associated Conditional of Enthymemes.Gilbert Plumer - 2000 - In Christopher W. Tindale, Hans V. Hansen & Elmar Sveda (eds.), Argumentation at the Century's Turn [CD-ROM]. Ontario Society for the Study of Argumentation. pp. 1-8.
    Expressing a widely-held view, David Hitchcock claims that "an enthymematic argument ... assumes at least the truth of the argument's associated conditional ... whose antecedent is the conjunction of the argument's explicit premises and whose consequent is the argument's conclusion." But even definitionally, this view is problematic, since an argument's being "enthymematic" or incomplete with respect to its explicit premises means that the conclusion is not implied by these premises alone. The paper attempts to specify the ways in which the (...)
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  • Can Cogency Vanish?Gilbert Plumer - 2016 - Cogency: Journal of Reasoning and Argumentation 8 (1):89-109.
    This paper considers whether universally—for all (known) rational beings—an argument scheme or pattern can go from being cogent (well-reasoned) to fallacious. This question has previously received little attention, despite the centrality of the concepts of cogency, scheme, and fallaciousness. I argue that cogency has vanished in this way for the following scheme, a common type of impersonal means-end reasoning: X is needed as a basic necessity or protection of human lives, therefore, X ought to be secured if possible. As it (...)
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  • Implicit Premises.John Hoaglund - unknown
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