2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77363We show that every star product on a symplectic manifold defines uniquely a 1-differentiable deformation of the Poisson bracket. Explicit formulas are given. As a corollary we can identify the characteristic class of any star product as a part of its explicit (Fedosov) expression.20 pagesQuantum AlgebraSymplectic Geometry58H15 58F05 81S10text