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

Authors
Gilbert Edward Plumer
University of Illinois, Urbana-Champaign (PhD)
Abstract
In their book EVALUATING CRITICAL THINKING Stephen Norris and Robert Ennis say: “Although it is tempting to think that certain [unstated] assumptions are logically necessary for an argument or position, they are not. So do not ask for them.” Numerous writers of introductory logic texts as well as various highly visible standardized tests (e.g., the LSAT and GRE) presume that the Norris/Ennis view is wrong; the presumption is that many arguments have (unstated) necessary assumptions and that readers and test takers can reasonably be expected to identify such assumptions. This paper proposes and defends criteria for determining necessary assumptions of arguments. Both theoretical and empirical considerations are brought to bear.
Keywords enthymeme  implicit assumption  missing premise  gap-filler  standardized tests  principle of charity  corresponding conditional  associated conditional  rules of inference  Robert Ennis
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References found in this work BETA

Enthymematic Arguments.David Hitchcock - 1985 - Informal Logic 7 (2).
A General Logic.John Slaney - 1990 - Australasian Journal of Philosophy 68 (1):74 – 88.
Enthymematic Consequence.Rolf George - 1972 - American Philosophical Quarterly 9 (1):113 - 116.
A Definition of Enthymematic Consequence.Tomis Kapitan - 1980 - International Logic Review 9:56-59.
Enthymematic Consequence.David Makinson - 1973 - Journal of Symbolic Logic 38 (2):325-325.

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Citations of this work BETA

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.
­A Defense of Analogy Inference as Sui Generis.André Lars Joen Juthe - forthcoming - Logic and Logical Philosophy:1.

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