B. Feigin et al., ON ALGEBRAIC EQUATIONS SATISFIED BY HYPERGEOMETRIC CORRELATORS IN WZWMODELS .1., Communications in Mathematical Physics, 163(1), 1994, pp. 173-184
It is proven that integral expressions for conformal correlators in sl
(2) WZW model found in [SV] satisfy certain natural algebraic equation
s. This implies that the above integrals really take their values in s
paces of conformal blocks.