Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Algebraic reformulation of Connes embedding problem and the free group
  algebra   We give a modification of I. Klep and M. Schweighofer algebraic reformulation
of Connes' embedding problem by considering *-algebra of the countably
generated free group. This allows to consider only quadratic polynomials in
unitary generators instead of arbitrary polynomials in self-adjoint generators.

5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs