Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: L^{4,\infty}-solution to the Navier-Stokes Equations in four-dimensional
  space   In this paper, we have showed $L^{4,\infty}$-solutions to the cauchy problem
for the four-dimensional Navier-Stokes equations are smooth through backward
uniqueness and analytic functions properties .

35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess