2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60804Duality between the coloured quantum group and the coloured quantum algebra corresponding to GL(2) is established. The coloured L^{\pm} functionals are constructed and the dual algebra is derived explicitly. These functionals are then employed to give a coloured generalisation of the differential calculus on quantum GL(2) within the framework of the R-matrix approach.15 pages LaTeX, published in Lett. Math. PhysQuantum AlgebraMathematical Physics16W30, 17B37, 81R50text