Block diagonalization for algebra's associated with block codes

Details Block diagonalization for algebra's associated with block codes Block diagonalization for algebra's associated with block codes

2009-10-23

arxiv.org/abs/0910.4515v1

Mathematics

Optimization and Control

16 pages

Scientific paper

For a matrix *-algebra B, consider the matrix *-algebra A consisting of the symmetric tensors in the n-fold tensor product of B. Examples of such algebras in coding theory include the Bose-Mesner algebra and Terwilliger algebra of the (non)binary Hamming cube, and algebras arising in SDP-hierarchies for coding bounds using moment matrices. We give a computationally efficient block diagonalization of A in terms of a given block diagonalization of B, and work out some examples, including the Terwilliger algebra of the binary- and nonbinary Hamming cube. As a tool we use some basic facts about representations of the symmetric group.

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