Weyl-Titchmarsh functions of vector-valued Sturm-Liouville operators on the unit interval

Details Weyl-Titchmarsh functions of vector-valued Sturm-Liouville operators on the unit interval Weyl-Titchmarsh functions of vector-valued Sturm-Liouville operators on the unit interval

2008-08-19

arxiv.org/abs/0808.2547v2

Mathematics

Spectral Theory

34 pages; typos corrected

Scientific paper

The matrix-valued Weyl-Titchmarsh functions $M(\lambda)$ of vector-valued Sturm-Liouville operators on the unit interval with the Dirichlet boundary conditions are considered. The collection of the eigenvalues (i.e., poles of $M(\lambda)$) and the residues of $M(\lambda)$ is called the spectral data of the operator. The complete characterization of spectral data (or, equivalently, $N\times N$ Weyl-Titchmarsh functions) corresponding to $N\times N$ self-adjoint square-integrable matrix-valued potentials is given, if all $N$ eigenvalues of the averaged potential are distinct.

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