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dc.contributor.authorÁlvarez Faura, M. del Carme
dc.contributor.authorBalcázar Navarro, José Luis
dc.contributor.authorJenner, Birgit
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Ciències de la Computació
dc.date.accessioned2020-10-28T11:22:14Z
dc.date.available2020-10-28T11:22:14Z
dc.date.issued1991-11
dc.identifier.citationAlvarez, C.; Balcazar, J.L.; Jenner, B. Adaptive logspace reducibility and parallel time. 1991.
dc.identifier.urihttp://hdl.handle.net/2117/330912
dc.description.abstractWe discuss two notions of functional oracle for logarithmic space-bounded machines, which differ in whether there is only one oracle tape for both the query and the answer or a separate tape for the answer, which can still be read on while the next query is already being constructed. The first notion turns out to be basically non-adaptive, behaving like access to an oracle set. The second notion, on the other hand, is adaptive. By imposing appropriate bounds on the number of functional oracle queries made in this computation model, we obtain new characterizations of the NC and AC hierarchies; thus the number of oracle queries can be considered as a measure of parallel time. Using this characterization of parallel classes, we solve open questions of Wilson.
dc.format.extent17 p.
dc.language.isoeng
dc.relation.ispartofseriesLSI-91-48
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Informàtica
dc.subject.lcshComputational complexity
dc.titleAdaptive logspace reducibility and parallel time
dc.typeExternal research report
dc.subject.lemacComplexitat computacional
dc.contributor.groupUniversitat Politècnica de Catalunya. ALBCOM - Algorismia, Bioinformàtica, Complexitat i Mètodes Formals
dc.contributor.groupUniversitat Politècnica de Catalunya. LARCA - Laboratori d'Algorísmia Relacional, Complexitat i Aprenentatge
dc.rights.accessOpen Access
local.identifier.drac1837703
dc.description.versionPostprint (published version)
local.citation.authorAlvarez, C.; Balcazar, J. L.; Jenner, B.


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