2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56923Comparing the star product defined by Takhtajan on the Poisson-Lie group GL(2) and any star product calculated from the Kontsevich's graphs (any ''K-star product'') on the same group, we show, by direct computation, that the Takhtajan star product on GL(2) can't be written as a K-star product.19 pages, 10 figuresMathematical PhysicsQuantum Algebratext