Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Herrero's Approximation Problem for Quasidiagonal Operators   Let T be a quasidiagonal operator on a separable Hilbert space. Then T is the
norm limit of operators, each of which generate a finite dimensional
C*-algebra, if and only if the C*-algebra generated by T is exact.

15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an