Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Covariant quantum instruments   The structure of covariant instruments is studied and a general structure
theorem is derived. A detailed characterization is given to covariant
instruments in the case of an irreducible representation of a locally compact
group.

25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con