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Conservative deflationism?

Julien Murzi1,2, Lorenzo Rossi1

  • 11Philosophy Department (KGW), University of Salzburg, Salzburg, Austria.

Philosophical Studies
|January 28, 2020
PubMed
Summary
This summary is machine-generated.

Conservative deflationism, a theory of truth, faces significant challenges. This study argues that proposed defenses of conservative deflationism are unsuccessful, undermining the view that truth is merely a linguistic device.

Keywords:
CategoricityConservativenessDeflationismIsaacson's thesisReflection principlesTruth

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Area of Science:

  • Philosophy of Language
  • Logic
  • Metaphysics

Background:

  • Deflationary theories of truth posit that 'true' is a logical and linguistic tool for expressing generalizations.
  • A key tenet of deflationism is that truth theories must be conservative, not introducing new truths beyond the base theory.
  • However, arguments exist that adequate truth theories must be non-conservative, challenging the viability of deflationary truth.

Purpose of the Study:

  • To critically evaluate two prominent defenses of conservative deflationism.
  • To demonstrate the inherent difficulties in maintaining a conservative deflationary theory of truth.
  • To assess the compatibility of conservative deflationism with mathematical and logical theories.

Main Methods:

  • Analysis of the arguments presented by Waxman (2017) and Tennant (2002) for conservative deflationism.
  • Logical examination of the implications of these defenses for the nature of truth and mathematical theories.
  • Demonstration of how these defenses lead to either non-purely expressive truth notions or unacceptable consequences for mathematics.

Main Results:

  • Waxman's defense of conservative deflationism is shown to be unsuccessful, either by requiring a non-expressive notion of truth or by an inadequate conception of mathematics.
  • Tennant's conservative deflationism is also found to be untenable, collapsing into a non-conservative form when applied to arithmetic.
  • Both examined defenses fail to establish the coherence of conservative deflationary truth theories.

Conclusions:

  • The attempts to defend conservative deflationism, as presented by Waxman and Tennant, are ultimately unsuccessful.
  • Adequate theories of truth, particularly those involving mathematics, appear to necessitate non-conservative approaches.
  • The findings challenge the core tenets of deflationary truth theories and their applicability in formal systems.