Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A class of identities relating Whittaker and Bessel functions   Identities between Whittaker and modified Bessel functions are derived for
particular complex orders. Certain polynomials appear in such identities, which
satisfy a fourth order differential equation (not of hypergeometric type), and
they themselves can be expressed as particular linear combinations of products
of modified Bessel and confluent hypergeometric functions.

9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph