Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong Orbital Interaction in pi-pi Stacking System   A simple prototypical model of aromatic pi-pi stacking system -- benzene
sandwich dimer is investigated by ab initio calculations based on second-order
Moller-Plesset perturbation theory (MP2) and Minnesota hybrid functional
M06-2X.

34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat