Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Symmetric Operators in Noncommutative Geometry   In Noncommutative Geometry, as in quantum theory, classically real variables
are assumed to correspond to self-adjoint operators. We consider the relaxation
of the requirement of self-adjointness to mere symmetry for operators $X_i$
which encode space-time information.

30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an