Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Functional Integration in Bose Systems with Hard-Core Interaction   A grand canonical ensemble of interacting bosons is considered. The zero
temperature phase diagram is evaluated from the mean-field approximation of the
functional integral. Three phases are found: a superfluid, a normal fluid and a
Mott insulator.

25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph