Dialogue 30 (4):531- (1991)

Authors
Jack MacIntosh
University of Calgary
Abstract
In the first section of this paper I offer a necessary condition for members of a particular class of arguments to be acceptable asproofs. In the second section, I point out that a plausible extension of this principle reveals that a number of additional arguments cannot function successfully as proofs. Finally, I note that a number of theological arguments, particularly cosmological and ontological arguments, are suspect in the light of this extended principle. Standardly in the ontological argument, criticism falls on the conditional, modality-enriching premise which involves a move from possibility to actuality. I offer two defences of this premise, and argue that—as the use of Moore's extended maxim shows—the problem lies with the premise that asserts mere possibility.
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DOI 10.1017/s0012217300011859
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References found in this work BETA

A Logical Analysis of Some Value Concepts.Frederic Fitch - 1963 - Journal of Symbolic Logic 28 (2):135-142.
Proof of an External World.George Edward Moore - 1939 - Proceedings of the British Academy 25 (5):273--300.
Reliability, Justification, and the Problem of Induction.James van Cleve - 1984 - Midwest Studies in Philosophy 9 (1):555-567.
Existence and God.Pavel Tichy - 1979 - Journal of Philosophy 76 (8):403-420.
The Petitio: Aristotle'S Five Ways.John Woods & Douglas Walton - 1982 - Canadian Journal of Philosophy 12 (March):77-100.

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Paradox Lost.Jon Cogburn - 2004 - Canadian Journal of Philosophy 34 (2):195 - 216.
Modal Logics with the MacIntosh Rule.Brian F. Chellas & Krister Segerberg - 1994 - Journal of Philosophical Logic 23 (1):67 - 86.

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