Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Regular basis and R-matrices for the su(n)_k Knizhnik-Zamolodchikov
  equation   Dynamical R-matrix relations are derived for the group-valued chiral vertex
operators in the SU(n) WZNW model from the KZ equation for a general four-point
function including two step operators. They fit the exchange relations for the
U_q(sl_n) covariant quantum matrix derived previously by solving the dynamical
Yang-Baxter equation. As a byproduct, we extend the regular basis introduced
earlier for SU(2) chiral fields to SU(n) step operators and display the
corresponding triangular matrix representation of the braid group.

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The categories of this paper are: nucl-th
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The categories of this paper are: eess
29
The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
26
The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
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The categories of this paper are: nlin