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Date: Mon, 13 Aug 2001 15:33:50 -0300
From: Ivanilda Gomes Ferreira <iva@cbpf.br>
Subject: CLUBE DE SEXTA FEIRA
CLUBE DA SEXTA FEIRA
Devido ąs restricoes energeticas no CBPF os
encontros em teorias do campo do
"Club Formerly Known as Friday Club",
serao realizados ąs quartas-feiras, a cada
quinze dias, ąs 14.00 horas.
O proximo encontro serį realizado no dia 15
de agosto, conforme abaixo:
Seminario do Clube
Palestrante: Prof. Renato Portugal (LNCC)
Titulo: Group-theoretic Approach for Symbolic
Tensor Manipulation
Dia: 15/08/2001 HORARIO: 14H
Local: Auditorio do 5 andar
Resumo: We describe how Computational Group Theory can be used to
manipulate indexed objects such as tensors, spinors, and so on.
The intrinsic symmetries of the indexed objects are
represented by permutation groups as well as the symmetries that
describe
the interchange of names of dummy indices.
The problem of finding canonical forms for expressions with indexed
objects
reduces to finding double coset canonical representatives.
This approach is useful to build algorithms for tensor manipulation
which
can be implemented in computer algebra systems.
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