Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Transforming Functions of a Certain Dot-Product Gradient Operator   In this paper it is shown that a function of the constant dot product of the
gradient operator acting on an arbitrary function can be transformed to a
double three-dimensional integral. The inner one of them is a Fourier transform
of the operator function. The result converted to one-dimensional problems is
also useful in transforming complex differential expressions.

20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat