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FRAGMENTS OF APPROXIMATE COUNTING

Published online by Cambridge University Press:  25 June 2014

SAMUEL R. BUSS ,
LESZEK ALEKSANDER KOŁODZIEJCZYK  and
NEIL THAPEN
SAMUEL R. BUSS
Affiliation:
DEPARTMENT OF MATHEMATICS, UNIVERSITY OF CALIFORNIA, SAN DIEGO, LA JOLLA, CA 92093-0112, USAE-mail:[email protected]
LESZEK ALEKSANDER KOŁODZIEJCZYK
Affiliation:
INSTITUTE OF MATHEMATICS, UNIVERSITY OF WARSAW, BANACHA 2, 02-097 WARSZAWA, POLANDE-mail:[email protected]
NEIL THAPEN
Affiliation:
INSTITUTE OF MATHEMATICS, ACADEMY OF SCIENCES OF THE CZECH REPUBLIC, ŽITNÁ 25, 115 67 PRAHA 1, CZECH REPUBLICE-mail:[email protected]
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Abstract

We study the long-standing open problem of giving $\forall {\rm{\Sigma }}_1^b$ separations for fragments of bounded arithmetic in the relativized setting. Rather than considering the usual fragments defined by the amount of induction they allow, we study Jeřábek’s theories for approximate counting and their subtheories. We show that the $\forall {\rm{\Sigma }}_1^b$ Herbrandized ordering principle is unprovable in a fragment of bounded arithmetic that includes the injective weak pigeonhole principle for polynomial time functions, and also in a fragment that includes the surjective weak pigeonhole principle for FPNP functions. We further give new propositional translations, in terms of random resolution refutations, for the consequences of $T_2^1$ augmented with the surjective weak pigeonhole principle for polynomial time functions.

Keywords

Approximate countingbounded arithmeticordering principleweak pigeonhole principlerandom resolutionpolynomial local search
Type
Articles
Information
The Journal of Symbolic Logic , Volume 79 , Issue 2 , June 2014 , pp. 496 - 525
Copyright
Copyright © The Association for Symbolic Logic 2014 

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