2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/69068It is shown that Section 8 of Plesken's 1983 lecture notes describes blocks of cyclic defect group up to Morita equivalence. In particular such a block is determined by its planar embedded Brauer tree. Applying the radical idealizer process, the head order of such blocks is calculated explicitly.Representation Theory20C11text