Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Le rang des tissus de Nakai   According to Alain H\'enaut, a planar 4-web is called Nakai's web if the
cross-ratio of the tangents to the four foliations at each point is constant
and if it has no hexagonal 3-subweb. We prove that Nakai's webs have rank 0 or
1. We give examples with rank 1 and present a universal way to build such
examples.

37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
16
The categories of this paper are: stat
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci