Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simple proof of blow up criterion of Bjorland and Vasseur for
  Navier-Stokes equations   In this paper, we present a simple proof of blow up criterion of Bjorland and
Vasseur for three dimensional Navier-Stokes equations by energy method and some
facts in real analysis.

21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas