Canonical forms for complex matrix congruence and *congruence

Details Canonical forms for complex matrix congruence and *congruence Canonical forms for complex matrix congruence and *congruence

2007-09-16

arxiv.org/abs/0709.2473v1

Linear Algebra Appl. 416 (2006) 1010-1032

Mathematics

Representation Theory

31 pages

Scientific paper

10.1016/j.laa.2006.01.005

Canonical forms for congruence and *congruence of square complex matrices were given by Horn and Sergeichuk in [Linear Algebra Appl. 389 (2004) 347-353], based on Sergeichuk's paper [Math. USSR, Izvestiya 31 (3) (1988) 481-501], which employed the theory of representations of quivers with involution. We use standard methods of matrix analysis to prove directly that these forms are canonical. Our proof provides explicit algorithms to compute all the blocks and parameters in the canonical forms. We use these forms to derive canonical pairs for simultaneous congruence of pairs of complex symmetric and skew-symmetric matrices as well as canonical forms for simultaneous *congruence of pairs of complex Hermitian matrices.

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