Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Uniform estimates for the semi-periodic eigenvalues of the singular
  differential operators   Let $m\in \mathbb{N}$, $\alpha\in[0,1]$, and $V$ be a 1-periodic
complex-valued distribution in the negative Sobolev space $H^{-m\alpha}[0,1]$.
The singular non-self-adjoint eigenvalue problem $D^{2m}u+V u=\lambda u$, $D=-i
d/dx$, with semi-periodic boundary conditions is investigated. The uniform in
$V$ asymptotic and non-asymptotic eigenvalue estimates are found and proved.
The case of periodic boundary conditions was studied by authors earlier.

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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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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: math-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: stat