Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the $W^2_p$ Estimate for Oblique Derivative Problem in Lipschitz
  Domains   The aim of this paper is to establish $W^2_p$ estimate for non-divergence
form second-order elliptic equations with the oblique derivative boundary
condition in domains with small Lipschitz constants. Our result generalizes
those in [14, 15], which work for $C^{1,\alpha}$ domains with $\alpha > 1-1/p$.
As an application, we also obtain a solvability result. An extension to fully
nonlinear elliptic equations with the oblique derivative boundary condition is
also discussed.

12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs