Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Integrability in the dynamics of axially symmetric membranes   B\"acklund-type transformations in four-dimensional space-time and an
intriguing reduced zero-curvature formulation for axially symmetric membranes,
with diffeomorphism-, resp. Lorentz-, symmetries reappearing after orthonormal
gauge-fixing, are found.

25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg