Logic and Intensionality


Authors
Guido Imaguire
Universidade Federal do Rio de Janeiro
Abstract
There are different ways we use the expressions “extension” and “intension”. I specify in the first part of this paper two basic senses of this distinction, and try to show that the old metaphysical sense, by means of particular instance vs. universal, is more fundamental than the contemporary sense by means of substitutivity. In the second part, I argue that logic in general is essentially intensional, not only because logic is a rule-guided activity, but because even the extensional definition of a logic system presupposes an intensional notion of logical consequence. DOI:10.5007/1808-1711.2010v14n1p111
Keywords Extension  intensão  logical consequence.  conseqüência lógica.  Extensão  intension
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DOI 10.5007/1808-1711.2010v14n1p111
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References found in this work BETA

Frege: The Philosophy of Language.Michael Dummett - 1973 - British Journal for the Philosophy of Science 27 (1):79-92.
The Runabout Inference-Ticket.A. N. Prior - 1960 - Analysis 21 (2):38.
Frege: Philosophy of Language.Michael Dummett - 1974 - Philosophy 49 (190):438-442.
Tonk, Plonk and Plink.Nuel Belnap - 1962 - Analysis 22 (6):130-134.
Extensionality.Ruth Barcan Marcus - 1960 - Mind 69 (273):55-62.

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