Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Continuous Spectra of Generalized Kronig-Penney Model   The standard Kronig-Penney model with periodic $\delta$ potentials is
extended to the cases with generalized contact interactions. The eigen equation
which determines the dispersion relation for one-dimensional periodic array of
the generalized contact interactions is deduced with the transfer matrix
formalism. Numerical results are presented which reveal unexpected band spectra
with broader band gap in higher energy region for generic model with
generalized contact interaction.

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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: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg