2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/70149Covariance ties the noncommutative deformation of a space into a quantum space closely to the deformation of the symmetry into a quantum symmetry. Quantum deformations of enveloping algebras are governed by Drinfeld twists, inner automorphisms which relate the deformed to the undeformed coproduct. While Drinfeld twists naturally define a covariant star product on the space algebra, this product is in general not associative and does not yield a quantum space. It is reported that, nevertheless, there are certain Drinfeld twists which realize the quantum plane, quantum Euclidean 4-space, and quantum Minkowski space.4 pages; LaTeX (uses iopart class); to appear in the proceedings of Group24 (Paris, 2002)Quantum AlgebraHigh Energy Physics - Theory81R60; 17B37text