Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Letter to the editor: A short complex-variable proof of the Titchmarsh
  convolution theorem   The Titchmarsh convolution theorem is a celebrated result about the support
of the convolution of two functions. We present a simple proof based on the
canonical factorization theorem for bounded holomorphic functions on the unit
disk.

32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio