Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum mechanics in a cut Fock space   A recently introduced numerical approach to quantum systems is analyzed. The
basis of a Fock space is restricted and represented in an algebraic program.
Convergence with increasing size of basis is proved and the difference between
discrete and continuous spectrum is stressed. In particular a new scaling low
for nonlocalized states is obtained. Exact solutions for several cases as well
as general properties of the method are given.

10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph