Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Lagrangian of a Self-Dual Gravitational Field as a Limit of the SDYM
  Lagrangian   The action for the su(N) SDYM equations is shown to give in the limit $N \to
\infty$ the action for the six-dimensional version of the second heavenly
equation. The symmetry reductions of this latter equation to the well known
equations of self-dual gravity are given. The Moyal deformation of the heavenly
equations are also considered.

26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat