Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On nonequivalence of regular boundary points for second-order elliptic
  operators   In this paper we present examples of nondivergence form second order elliptic
operators with continuous coefficients such that $L$ has an irregular boundary
point that is regular for the Laplacian. Also for any eigenvalue spread <1 of
the matrix of the coefficients we provide an example of operator with
discontinuous coefficients that has regular boundary points nonequivalent to
Laplacian's (we give examples for each direction of nonequivalence).
  All examples are constructed for each dimension starting with 3.

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The categories of this paper are: hep-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
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The categories of this paper are: cs
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg