Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lattice representation and dark solitons of the Fokas-Lenells equation   This work is devoted to an integrable generalization of the nonlinear
Schr\"odinger equation proposed by Fokas and Lenells. I discuss the
relationships between this equation and other integrable models. Using the
reduction of the Fokas-Lenells equation to the already known ones I obtain the
N-dark soliton solutions.

24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex