Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Mechanics without an Equation of Motion   We propose a formulation of quantum mechanics in three dimensions with
spherical symmetry for a finite level system whose dynamics is not governed by
a differential equation of motion. The wavefunction is written as an infinite
sum in a complete set of square integrable functions. Interaction in the theory
is introduced in function space by a real finite tridiagonal symmetric matrix.
Information about the structure and dynamics of the system is contained in the
scattering matrix, which is defined in the usual way.

15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
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The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph