Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Minimal flat Lorentzian surfaces in Lorentzian complex space forms   In this article we study minimal flat Lorentzian surfaces in Lorentzian
complex space forms. First we prove that, for minimal flat Lorentzian surfaces
in a Lorentzian complex form, the equation of Ricci is a consequence of the
equations of Gauss and Codazzi. Then we classify minimal flat Lorentzian
surfaces in the Lorentzian complex plane ${\bf C}^2_1$. Finally, we classify
minimal flat slant surfaces in Lorentzian complex projective plane $CP^2_1$ and
in Lorentzian complex hyperbolic plane $CH^2_1$.

17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg