Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Application of equivalence method to Monge-Amp\`ere equations: Elliptic
  case   The application of equivalence method to classify Monge-Amp\`ere system leads
to three orbits, parabolic case, hyperbolic case and elliptic case wich
correspond to three types of Monge-Amp\`ere systems. In this paper we will
study the elliptic case and give a presentation of the group as a complex
group.

11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat