On the condition numbers of a multiple generalized eigenvalue

Details On the condition numbers of a multiple generalized eigenvalue On the condition numbers of a multiple generalized eigenvalue

2010-08-06

arxiv.org/abs/1008.1201v2

Mathematics

Numerical Analysis

Scientific paper

For standard eigenvalue problems, a closed-form expression for the condition numbers of a multiple eigenvalue is known. In particular, they are uniformly 1 in the Hermitian case, and generally take different values in the non-Hermitian case. We consider the generalized eigenvalue problem and identify the condition numbers of a multiple eigenvalue. Our main result is that a multiple eigenvalue generally has multiple condition numbers, even in the Hermitian definite case. The condition numbers are characterized in terms of the singular values of the outer product of the corresponding left and right eigenvectors.

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