Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exponentials of Normal Operators and Commutativity of Operators: A New
  Approach   We present a new approach to the question of when the commutativity of
operator exponentials implies that of the operators. This is proved in the
setting of bounded normal operators on a complex Hilbert space. The proofs are
based on some similarities results by Berberian and Embry as well as the
celebrated Fuglede theorem.

22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom