Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exact ground state of the generalized three-dimensional
  Shastry-Sutherland model   We generalize the Shastry-Sutherland model to three dimensions. By
representing the model as a sum of the semidefinite positive projection
operators, we exactly prove that the model has exact dimer ground state.
Several schemes for constructing the three-dimensional Shastry-Sutherland model
are proposed.

10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga