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TRUTH AND FEASIBLE REDUCIBILITY

Published online by Cambridge University Press:  20 September 2019

ALI ENAYAT ,
MATEUSZ ŁEŁYK  and
BARTOSZ WCISŁO
ALI ENAYAT
Affiliation:
DEPARTMENT OF PHILOSOPHY, LINGUISTICS, AND THEORY OF SCIENCE UNIVERSITY OF GOTHENBURG, BOX 200 405 30 GOTHENBURG, SWEDEN E-mail: ali.enayat@gu.se
MATEUSZ ŁEŁYK
Affiliation:
INSTITUTE OF PHILOSOPHY UNIVERSITY OF WARSAW UL. KRAKOWSKIE PRZEDMIEŚCIE 3 00-927 WARSZAWA, POLAND E-mail: mlelyk@uw.edu.pl
BARTOSZ WCISŁO
Affiliation:
INSTITUTE OF MATHEMATICS, POLISH ACADEMY OF SCIENCES UL. ŚNIADECKICH 8 00-656 WARSZAWA, POLAND E-mail: b.wcislo@impan.pl
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Abstract

Let ${\cal T}$ be any of the three canonical truth theories CT− (compositional truth without extra induction), FS− (Friedman–Sheard truth without extra induction), or KF− (Kripke–Feferman truth without extra induction), where the base theory of ${\cal T}$ is PA (Peano arithmetic). We establish the following theorem, which implies that ${\cal T}$ has no more than polynomial speed-up over PA.

Theorem.${\cal T}$is feasibly reducible to PA, in the sense that there is a polynomial time computable function f such that for every${\cal T}$-proof π of an arithmetical sentence ϕ, f (π) is a PA-proof of ϕ.

Keywords

Primary 03F3003C62Secondary 03D1503H15axiomatic theories of truthcompositional truthconservativityfeasible computationspolynomial simulationreducibilityspeed-uptruth predicates

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Type
Articles
Information
The Journal of Symbolic Logic , Volume 85 , Issue 1 , March 2020 , pp. 367 - 421
Copyright
Copyright © The Association for Symbolic Logic 2019 

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