Upper bounds for the complexity of sparse and tally descriptions
Identifieur interne : 001341 ( Istex/Corpus ); précédent : 001340; suivant : 001342Upper bounds for the complexity of sparse and tally descriptions
Auteurs : V. Arvind ; J. Köbler ; M. MundhenkSource :
- Mathematical systems theory [ 0025-5661 ] ; 1996-02-01.
Abstract
Abstract: We investigate the complexity of computing small descriptions for sets in various reduction classes to sparse sets. For example, we show that if a setA and its complement conjunctively reduce to some sparse set, then they also are conjunctively reducible to a P(A ⊕ SAT)-printable tally set. As a consequence, the class IC[log,poly] of sets with low instance complexity is contained in theEL 1 Σ -level of the extended low hierarchy. By refining our techniques, we also show that all word-decreasing self-reducible sets in IC[log, poly] are in NP ∩ co-NP and therefore low for NP. We derive similar results for sets inR d p (SPARSE) andR hd p (R c p (SPARSE)), as well as in some nondeterministic reduction classes to sparse sets.
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DOI: 10.1007/BF01201814
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<front><div type="abstract" xml:lang="en">Abstract: We investigate the complexity of computing small descriptions for sets in various reduction classes to sparse sets. For example, we show that if a setA and its complement conjunctively reduce to some sparse set, then they also are conjunctively reducible to a P(A ⊕ SAT)-printable tally set. As a consequence, the class IC[log,poly] of sets with low instance complexity is contained in theEL 1 Σ -level of the extended low hierarchy. By refining our techniques, we also show that all word-decreasing self-reducible sets in IC[log, poly] are in NP ∩ co-NP and therefore low for NP. We derive similar results for sets inR d p (SPARSE) andR hd p (R c p (SPARSE)), as well as in some nondeterministic reduction classes to sparse sets.</div>
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