2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150827It is shown that quantum Euclidean groups $E_q(2)$, $E_κ(2)$ and $E_κ(3)$ have the structure of generalised crossed products.6 pages, LaTeX2e, uses heron2e.sty (included). Contribution to the proceedings of XXI International Colloquium on Group Theoretical Methods in Physics, Goslar, Germany 1996. Condition (ii) in the definition of a crossed product correctedQuantum AlgebraMathematical Physicstext