Titel: On blocks with cyclic defect group and their head orders.

Author: Gabriele Nebe, Abteilung Reine Mathematik, Universit\"at Ulm, 89069 Ulm, Germany

Status: Preprint.

Abstract:
It 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.