Integrability of the Wess_Zumino-Witten model as a non-ultralocal theory

S. Rajeev A. Stern, P. Vitale

We consider the 2--dimensional Wess--Zumino--Witten (WZW) model in the canonical formalism introduced in a previous paper by two of us. Using an $r$--$s$ matrix approach to non--ul…