Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Insufficiency of the Brauer-Manin obstruction applied to etale covers   Let k be any global field of characteristic not 2. We construct a k-variety X
such that X(k) is empty, but for which the emptiness cannot be explained by the
Brauer-Manin obstruction or even by the Brauer-Manin obstruction applied to
finite etale covers.

1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph