3004 2014 eng 634 641 4 218 article Elsevier 0 -- 2025-05-07 -- We give a description in terms of generators and relations of character Hopf algebras. These Hopf algebras play a central role in the classification of pointed Hopf algebras and can be seen as generalized quantum groups. Furthermore, we get as a consequence an analog presentation of Nichols algebras of diagonal type. Journal of Pure and Applied Algebra 10.1016/j.jpaa.2013.08.003 publish 2 Ja Michael Helbig Fakultät für Angewandte Natur- und Geisteswissenschaften