2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153376We clarify the relation between the `bosonisation' construction (due to the author) which can be used to turn a Hopf algebra $B$ in the category of $H$-modules or $H$-comodules into an equivalent ordinary Hopf algebra, and a version of Radfords theorem (also due in this form to the author) which does the same for $B$ in the category of crossed $H$-modules. We also comment on reconstruction from the category of $B$-comodules.16 pages, LATEX, 1.5 figuresQuantum Algebratext