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Topics in Computational Algebra

1990. Auflage. Book. Sprache: Englisch.
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The main purpose of these lectures is first to briefly survey the fundamental con nection between the representation theory of the symmetric group Sn and the theory of symmetric functions and second to show how combinatorial methods that arise natura … weiterlesen
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Topics in Computational Algebra als Buch

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Titel: Topics in Computational Algebra

ISBN: 0792311175
EAN: 9780792311171
1990. Auflage.
Book.
Sprache: Englisch.
Herausgegeben von G. M. Piacentini Cattaneo, Elisabetta Strickland
Springer Netherlands

31. Januar 1991 - gebunden - 270 Seiten

Beschreibung

The main purpose of these lectures is first to briefly survey the fundamental con nection between the representation theory of the symmetric group Sn and the theory of symmetric functions and second to show how combinatorial methods that arise naturally in the theory of symmetric functions lead to efficient algorithms to express various prod ucts of representations of Sn in terms of sums of irreducible representations. That is, there is a basic isometry which maps the center of the group algebra of Sn, Z(Sn), to the space of homogeneous symmetric functions of degree n, An. This basic isometry is known as the Frobenius map, F. The Frobenius map allows us to reduce calculations involving characters of the symmetric group to calculations involving Schur functions. Now there is a very rich and beautiful theory of the combinatorics of symmetric functions that has been developed in recent years. The combinatorics of symmetric functions, then leads to a number of very efficient algorithms for expanding various products of Schur functions into a sum of Schur functions. Such expansions of products of Schur functions correspond via the Frobenius map to decomposing various products of irreducible representations of Sn into their irreducible components. In addition, the Schur functions are also the characters of the irreducible polynomial representations of the general linear group over the complex numbers GLn(C).

Inhaltsverzeichnis

Branching Functions for Winding Subalgebras and Tensor Products.
Computing with Characters of Finite Groups.
Some Remarks on the Computation of Complements and Normalizers in Soluble Groups.
Methods for Computing in Algebraic Geometry and Commutative Algebra.
Combinatorial Algorithms for the Expansion of Various Products of Schur Functions.
Polynomial Identities for 2 x 2 Matrices.
Cayley Factorization and a Straightening Algorithm.
The Nagata-Higman Theorem.
Supersymmetric Bracket Algebra and Invariant Theory.
Aspects of Characteristic-Free Representation Theory of GLn, and Some Applications to Intertwining Numbers.
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