Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elements of a Global Operator Approach to Wess-Zumino-Novikov-Witten
  Models   Elements of a global operator approach to the WZNW models for compact Riemann
surfaces of arbitrary genus g with N marked points were given by Schlichenmaier
and Sheinman. This contribution reports on the results. The approach is based
on the multi-point Krichever-Novikov algebras of global meromorphic functions
and vector fields, and the global algebras of affine type and their
representations. Using the global Sugawara construction and the identification
of a certain subspace of the vector field algebra with the tangent space to the
moduli space of the geometric data, Knizhnik-Zamalodchikov equations are
defined. Some steps of the approach of Tsuchia, Ueno and Yamada to WZNW models
are presented to compare it with our approach.

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