The Logic of Opacity


Authors
Jeffrey Sanford Russell
University of Southern California
Andrew Bacon
University of Southern California
Abstract
We explore the view that Frege's puzzle is a source of straightforward counterexamples to Leibniz's law. Taking this seriously requires us to revise the classical logic of quantifiers and identity; we work out the options, in the context of higher-order logic. The logics we arrive at provide the resources for a straightforward semantics of attitude reports that is consistent with the Millian thesis that the meaning of a name is just the thing it stands for. We provide models to show that some of these logics are non-degenerate.
Keywords opacity  Frege's puzzle  Leibniz's law  higher-order logic  proper names
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DOI 10.1111/phpr.12454
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References found in this work BETA

To Be F Is To Be G.Cian Dorr - 2016 - Philosophical Perspectives 30 (1):39-134.
On Sense and Reference.Gottlob Frege - 2010 - In Darragh Byrne & Max Kölbel (eds.), Arguing About Language. Routledge. pp. 36--56.
Word and Object.Willard Van Orman Quine - 1960 - Les Etudes Philosophiques 17 (2):278-279.
Semantical Considerations on Modal Logic.Saul A. Kripke - 1963 - Acta Philosophica Fennica 16 (1963):83-94.

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Citations of this work BETA

Classical Opacity.Michael Caie, Jeremy Goodman & Harvey Lederman - forthcoming - Philosophy and Phenomenological Research.
Sense, Reference and Substitution.Jeremy Goodman & Harvey Lederman - forthcoming - Philosophical Studies:1-6.

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