2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53713The Liouville action emerges as the effective action of 2-d gravity in the process of path integral quantization of the bosonic string. It yields a measure of the violation of classical symmetries of the theory at the quantum level. Certain aspects of the residual SL(2,R) invariance of the gauge-fixed Liouville theory are disscussed. ( Lectures presented at the Danube Workshop '93, June 1993, Belgrade, Yugoslavia.)18 pages, Plain TexHigh Energy Physics - Theorytext