Álgebras associadas a grafos orientados em níveis e a propriedade da Koszulidade

• Autor(a) principal: Vasconcelos, José Eder Salvador de
• Data de Publicação: 2014
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/4444
• topic: Grafos orientados em níveis; Funções geradoras do traço graduado; Representa ções irredutíveis; Multiplicidades; Propriedade da koszulidade; Layered directed graphs; Graded trace generating functions; Irreducibles representations; Multiplicities; Koszulity property; MATEMATICA::ALGEBRA

In this work we study classes of algebras associated with layered directed graphs. Let be a layered directed graph. We determine the algebra Apq; generated by the edges of the graph, satisfying a set of quadratic relations R; and the dual algebra Apq!, associated with grpApqq. For each P Autpq we determine: the algebra Ap q; where is the subgraph of whose vertices are xed by ; the graded trace generating functions Tr pApq; tq and Tr pApq!; tq: We also determine the multiplicities of the irreducible representations of AutpApqq acting on Apq and Apq!: We show that for a layered directed graph , satisfying some hypotheses, AutpApqq K Autpq. Finally, we verify the property Tr pApq; tq Tr pApq!; tq 1 for all P Autpq, 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: