{"id":3760,"date":"1994-01-01T00:00:00","date_gmt":"1994-01-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/1994\/01\/01\/parallel-time-and-sequential-reducibilities\/"},"modified":"1994-01-01T00:00:00","modified_gmt":"1994-01-01T00:00:00","slug":"parallel-time-and-sequential-reducibilities","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/matematicas\/parallel-time-and-sequential-reducibilities\/","title":{"rendered":"Parallel time and sequential reducibilities"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Carme Alvarez Faura <\/strong><\/h2>\n<p>La tesis es un estudio teorico de las clases de problemas computacionales resolubles muy rapidamente mediante modelos paralelos de calculo. En particular, se estudia la estructura fina de las clases nc y ac definidas por pippenger y cook.  la primera parte de la tesis estudia algunos problemas concretos y los clasifica de forma optima en subclases de nc; asi, el problema de la pertenencia a lenguajes definidos por redes de petri es completo para la clase tc, y el problema de la equiValencia de trazas esta en nc2. Para poder clasificar otro tipo de problemas, se introducen despues nuevas clases de funciones asociadas a problemas de conteo para maquinas indeterministas que funcionan en espacio logaritmico. En particular, se estudian las propidades de las clases  l, span-l y opt-l, sus analogias con clases de conteo en tiempo polinomico, y se identifican algunos problemas completos para cada una de ellas.  la segunda parte utiliza las nociones de reducibilidad en tiempo polilogaritmico y reducibilidad adaptiva del espacio logaritmico para dar teoremas de descomposicion de las jerarquias ac y nc. Los resultados cierran casi completamente problemas abiertos por c. Wilson.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Parallel time and sequential reducibilities<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Parallel time and sequential reducibilities <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Carme Alvarez Faura <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/01\/1994<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Birgit Jenner<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Joaquim Gabarr\u00f3 Vall\u00e9s <\/li>\n<li>W. Allender Eric (vocal)<\/li>\n<li>Felipe Cucker Farkas (vocal)<\/li>\n<li>Klaus-jorn Lange (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Carme Alvarez Faura La tesis es un estudio teorico de las clases de problemas computacionales resolubles muy [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[1890,126,15596,15624],"tags":[15626,15625,15629,15627,15630,15628],"class_list":["post-3760","post","type-post","status-publish","format-standard","hentry","category-ciencia-de-los-ordenadores","category-matematicas","category-politecnica-de-catalunya","category-software","tag-birgit-jenner","tag-carme-alvarez-faura","tag-felipe-cucker-farkas","tag-joaquim-gabarro-valles","tag-klaus-jorn-lange","tag-w-allender-eric"],"_links":{"self":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/3760","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/comments?post=3760"}],"version-history":[{"count":0,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/3760\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/media?parent=3760"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/categories?post=3760"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/tags?post=3760"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}