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On the complexity of identifying head-elementary-set-free programs

Published online by Cambridge University Press:  13 November 2009

FABIO FASSETTI  and
LUIGI PALOPOLI
FABIO FASSETTI
Affiliation:
ICAR/CNR, Via P. Bucci 41C, 87036 Rende (CS), Italy (e-mail: f.fassetti@deis.unical.it)
LUIGI PALOPOLI
Affiliation:
DEIS, University of Calabria, Via P. Bucci 41C, 87036 Rende (CS), Italy (e-mail: palopoli@deis.unical.it)
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Abstract

Head-elementary-set-free (HEF) programs were proposed in (Gebser et al. 2007) and shown to generalize over head-cycle-free programs while retaining their nice properties. It was left as an open problem in (Gebser et al. 2007) to establish the complexity of identifying HEF programs. This note solves the open problem by showing that the problem is complete for coNP.

Keywords

computational complexityelementary setdisjunctive logic programhead-elementary-set-free program
Type
Technical Note
Information
Theory and Practice of Logic Programming , Volume 10 , Issue 1 , January 2010 , pp. 113 - 123
Copyright
Copyright © Cambridge University Press 2009

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