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On Showing Invalidity

Thomas J. McKay

Canadian Journal of Philosophy 14 (1):97 - 101 (1984)

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(1 other version)The Rise of Informal Logic: Essays on Argumentation, Critical Thinking, Reasoning, and Politics.Ralph Henry Johnson - 1996 - Newport, VA, USA: Vale Press. Edited by J. Anthony Blair, Trudy Govier, Leo Groarke, John Hoaglund & Christopher W. Tindale.details We are pleased to release this edition of Ralph Johnson’s The Rise of Informal Logic as Volume 2 in the series Windsor Studies in Argumentation. This edition is a reprint of the previous Vale Press edition with some typographical errors and other minor mistakes corrected. The prime motive for gathering Ralph H. Johnson’s essays under one cover is their clear articulation of the goals, concerns and problems of the discipline of informal logic. To my knowledge all of the published articles, (...) Download Export citation Bookmark 62 citations
Most assur'd of what he is most ignorant.Michael J. Wreen - 1996 - Erkenntnis 44 (3):341 - 368.details Download Export citation Bookmark
The Asymmetry Thesis and the Diversity of "Invalid" Argument-Forms.George Bowles - 1999 - Informal Logic 19 (1).details According to the Asymmetry Thesis, whereas there are many kinds of argument-forms that make at least some of their instances valid, there is none that makes any of its instances invalid. To refute this thesis, a counterexample has been produced in the form of an argument-form whose premise-form's instances are all logically true and whose conclusion form's instances are all logically false. The purpose of this paper is to show that there are many more kinds of argument-forms that make some (...) Download Export citation Bookmark

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