Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A construction method for discrete constant negative Gaussian curvature
  surfaces   This article is an application of the author's paper about a construction
method for discrete constant negative Gaussian curvature surfaces, the
nonlinear d'Alembert formula. The heart of this formula is the Birkhoff
decomposition, and we give a simple algorithm for the Birkhoff decomposition.
As an application, we draw figures of discrete constant negative Gaussian
curvature surfaces given by this method.

29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess