Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A report on Tarski's decidability problem   This paper contains a list of crucial mistakes and counterexamples to some of
the main statements in the paper "Elementary theory of free nonabelian groups"
by O. Kharlampovich and A. Myasnikov, which was published in the Journal of
Algebra in June 2006.

21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys