Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classical analytic solutions of the non-stationary Navier-Stokes
  equation in two, three and higher dimensions   In this paper we present a method to derive classical solutions of the
Navier-Stokes equations for non-stationary initial value problems in domain
$\mathbb{R}^n$ ($n=2,3$ or higher). Exact solutions in $\mathbb{R}^2$ and
$\mathbb{R}^3$ in the presence of an externally specified force are obtained by
imposing certain restrictions on the initial data.

26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci