Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized Jacobi operators in Krein spaces   A special class of generalized Jacobi operators which are self-adjoint in
Krein spaces is presented. A description of the resolvent set of such operators
in terms of solutions of the corresponding recurrence relations is given. In
particular, special attention is paid to the periodic generalized Jacobi
operators. Finally, the spectral properties of generalized Jacobi operators are
applied to prove convergence results for Pad\'e approximants.

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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol