Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological structure of the space of composition operators on the Hardy
  space of Dirichlet series   The aim of this paper is to study when two composition operators on the
Hilbert space of Dirichlet series with square summable coefficients belong to
the same component or when their difference is compact. As a corollary we show
that if a linear combination of composition operators with polynomial symbols
of degree at most 2 is compact, then each composition operator is compact.

5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin