Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An action for N=4 supersymmetric self-dual Yang-Mills theory   The $N=4$ supersymmetric self-dual Yang-Mills theory in a four- dimensional
space with signature $(2,2)$ is formulated in harmonic superspace. The on-shell
constraints of the theory are reformulated in the equivalent form of vanishing
curvature conditions for three gauge connections (one harmonic and two
space-time). The constraints are then obtained as variational equations from a
superspace action of the Chern-Simons type. The action is manifestly $SO(2,2)$
invariant. It can be viewed as the Lorentz-covariant form of the light-cone
superfield action proposed by Siegel.

30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga