2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/78431We use Berezin's quantization procedure to obtain a formal $U_q su_{1,1}$-invariant deformation of the quantum disc. Explicit formulae for the associated q-bidifferential operators are produced.LaTeX 2e, 9 pages, vaksman@ilt.kharkov.ua, sinelshchikov@ilt.kharkov.uaQuantum AlgebraMathematical PhysicsFunctional Analysis81R50 (Primary) 81Q99 (Secondary)text