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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Álgebras associadas a grafos orientados em níveis e a propriedade da Koszulidade / Algebras associated to layered directed graphs and Koszulity property

Vasconcelos, José Eder Salvador de 20 November 2014 (has links)
Submitted by Erika Demachki (erikademachki@gmail.com) on 2015-04-22T21:00:51Z No. of bitstreams: 2 Tese - José Eder Salvador de Vasconcelos - 2014.pdf: 10572296 bytes, checksum: 40616b346bd2479e01caf5eeea4cfe68 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Erika Demachki (erikademachki@gmail.com) on 2015-04-22T21:03:08Z (GMT) No. of bitstreams: 2 Tese - José Eder Salvador de Vasconcelos - 2014.pdf: 10572296 bytes, checksum: 40616b346bd2479e01caf5eeea4cfe68 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2015-04-22T21:03:08Z (GMT). No. of bitstreams: 2 Tese - José Eder Salvador de Vasconcelos - 2014.pdf: 10572296 bytes, checksum: 40616b346bd2479e01caf5eeea4cfe68 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2014-11-20 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In this work we study classes of algebras associated with layered directed graphs. Let 􀀀 be a layered directed graph. We determine the algebra Ap􀀀q; generated by the edges of the graph, satisfying a set of quadratic relations R; and the dual algebra Ap􀀀q!, associated with grpAp􀀀qq. For each P Autp􀀀q we determine: the algebra Ap􀀀 q; where 􀀀 is the subgraph of 􀀀 whose vertices are xed by ; the graded trace generating functions Tr pAp􀀀q; tq and Tr pAp􀀀q!; tq: We also determine the multiplicities of the irreducible representations of AutpAp􀀀qq acting on Ap􀀀q and Ap􀀀q!: We show that for a layered directed graph 􀀀, satisfying some hypotheses, AutpAp􀀀qq K Autp􀀀q. Finally, we verify the property Tr pAp􀀀q; tq Tr pAp􀀀q!; tq 1 for all P Autp􀀀q, called koszulity property. We consider two classes of algebras, the algebra associated to the Hasse graph of the partially ordered set of faces of a star polygon, Ap􀀀 q; and the algebra associated with the Hasse graph of the lattice of subespaces of a nite dimensional vector space over Fq; ApLpn; qqq: / Este trabalho apresenta o estudo de algumas classes de álgebras associadas a grafos orientados em níveis. Dado um grafo orientado em níveis 􀀀 (satisfazendo algumas propriedades) determinamos a álgebra Ap􀀀q gerada pelas arestas do grafo, satisfazendo um conjunto de relações quadráticas R, e a álgebra dual Ap􀀀q!, associada a grpAp􀀀qq. Para cada P Autp􀀀q determinamos o grafo 􀀀 ; o subgrafo de 􀀀 dos vértices xados por ; que dá origem à álgebra Ap􀀀 q e calculamos as funções geradoras do traço graduado Tr pAp􀀀q; tq e Tr pAp􀀀q!; tq: Determinamos as multiplicidades das representações irredutíveis de AutpAp􀀀qq sobre Ap􀀀q e Ap􀀀q!. Mostramos que para um grafo orientado em níveis 􀀀, satisfazendo certas hipóteses, tem-se AutpAp􀀀qq K Autp􀀀q. Finalmente, veri camos a validade da equação Tr pAp􀀀q; tq Tr pAp􀀀q!; tq 1 para todo P Autp􀀀q; a qual denominamos propriedade da koszulidade. Fazemos isso para duas classes de álgebras, a álgebra associada ao grafo de Hasse do conjunto parcialmente ordenado das faces de um polígono estrelado, Ap􀀀 q, e a álgebra associada ao grafo de Hasse do reticulado dos subespaços vetoriais de um espaço vetorial de dimensão nita sobre Fq, ApLpn; qqq.

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