Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Smooth analytic functions and model subspaces   The main themes of this survey are as follows: (a) the canonical
(Riesz--Nevanlinna) factorization in various classes of analytic functions on
the disk that are smooth up to its boundary, and (b) model subspaces (i.e.,
invariant subspaces of the backward shift) in the Hardy spaces $H^p$ and in
BMOA. It is the interrelationship and a peculiar cross-fertilization between
the two topics that we wish to highlight.

13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas