2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148218It is shown that zero ghost conformal blocks of coset theory G/H are determined uniquely by those of G and H theories. G/G theories are considered as an example, their structure constants and correlation functions on sphere are calculated.10 pages, preprint LANDAU-92-TMP-1, October 1992 (References added)High Energy Physics - Theorytext