Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solution to HJB equations with an elliptic integro-differential operator
  and gradient constraint   The main goal of this paper is to establish existence, regularity and
uniqueness results for the solution of a Hamilton-Jacobi-Bellman (HJB)
equation, whose operator is an elliptic integro-differential operator. The HJB
equation studied in this work arises in singular stochastic control problems
where the state process is a controlled $d$-dimensional L\'evy process.

23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex