Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Foliations associated to harmonic maps and some complex two ball
  quotients   The purpose of the article is to study a foliation associated to a
lattice-equivariant harmonic map of small rank from a complex ball to another.
The result is related to rigidity of some complex ball quotients.

32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
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
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci