Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Nyman, Beurling and Baez-Duarte's Hilbert space reformulation of the
  Riemann hypothesis   There has been a surge of interest of late in an old result of Nyman and
Beurling giving a Hilbert space formulation of the Riemann hypothesis. Many
authors have contributed to this circle of ideas, culminating in a beautiful
refinement due to Baez-Duarte. The purpose of this little survey is to
dis-entangle the resulting web of complications, and reveal the essential
simplicity of the main results.

15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas