2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/73356In late October 2004 I did a search on Hopf algebras in the database ZMATH to find out where they occur and what use is made of them (I.e. what applications there are). The result is a little astonishing, as can be seen from what follows.This is a preprepreprint. I hope for and expect lots of reactions and severe criticism (in the form of constructive remarks as to what to include in addition). 9 pagesQuantum Algebra16W30text