Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Projective-geometric aspects of homogeneous third-order Hamiltonian
  operators   We investigate homogeneous third-order Hamiltonian operators of
differential-geometric type. Based on the correspondence with quadratic line
complexes, a complete list of such operators for two and three components is
obtained.

37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph