Darboux transformations of Jacobi matrices and Padé approximation

Details Darboux transformations of Jacobi matrices and Padé approximation Darboux transformations of Jacobi matrices and Padé approximation

2010-12-16

arxiv.org/abs/1012.3712v2

Mathematics

Classical Analysis and ODEs

28 pages (some typos are corrected)

Scientific paper

10.1016/j.laa.2011.05.035

Let J be a monic Jacobi matrix associated with the Cauchy transform F of a probability measure. We construct a pair of the lower and upper triangular block matrices L and U such that J=LU and the matrix J_c=UL is a monic generalized Jacobi matrix associated with the function F_c(z)=zF(z)+1. It turns out that the Christoffel transformation J_c of a bounded monic Jacobi matrix J can be unbounded. This phenomenon is shown to be related to the effect of accumulating at infinity of the poles of the Pad\'e approximants of the function F_c although F_c is holomorphic at infinity. The case of the UL-factorization of J is considered as well.

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