Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of spectral anisotropy in the resolution of the
  three-dimensional Navier-Stokes equations   We present different classes of initial data to the three-dimensional,
incompressible Navier-Stokes equations, which generate a global in time, unique
solution though they may be arbitrarily large in the end-point function space
in which a fixed-point argument may be used to solve the equation locally in
time. The main feature of these initial data is an anisotropic distribution of
their frequencies. One of those classes is taken from previous papers by two of
the authors and collaborators, and another one is new.

15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex