TY - JOUR
T1 - Character tables and normal left coideal subalgebras
AU - Cohen, Miriam
AU - Westreich, Sara
N1 - Funding Information:
This research was supported by the ISRAEL SCIENCE FOUNDATION , 170-12 .
PY - 2014/10
Y1 - 2014/10
N2 - We continue studying properties of semisimple Hopf algebras H over algebraically closed fields of characteristic 0 resulting from their generalized character tables. We show that the generalized character table of H reflects normal left coideal subalgebras of H. These are the Hopf analogues of normal subgroups in the sense that they arise from Hopf quotients. We apply these ideas to prove Hopf analogues of known results in group theory. Among the rest we prove that columns of the character table are orthogonal and that all entries are algebraic integers. We analyze 'semi-kernels' and their relations to the character table. We prove a full analogue of the Burnside-Brauer theorem for almost cocommutative H. We also prove the Hopf algebras analogue of the following (Burnside) theorem: If G is a non-abelian simple group then {1} is the only conjugacy class of G which has prime power order.
AB - We continue studying properties of semisimple Hopf algebras H over algebraically closed fields of characteristic 0 resulting from their generalized character tables. We show that the generalized character table of H reflects normal left coideal subalgebras of H. These are the Hopf analogues of normal subgroups in the sense that they arise from Hopf quotients. We apply these ideas to prove Hopf analogues of known results in group theory. Among the rest we prove that columns of the character table are orthogonal and that all entries are algebraic integers. We analyze 'semi-kernels' and their relations to the character table. We prove a full analogue of the Burnside-Brauer theorem for almost cocommutative H. We also prove the Hopf algebras analogue of the following (Burnside) theorem: If G is a non-abelian simple group then {1} is the only conjugacy class of G which has prime power order.
UR - http://www.scopus.com/inward/record.url?scp=84899486783&partnerID=8YFLogxK
U2 - 10.1016/j.jpaa.2014.02.010
DO - 10.1016/j.jpaa.2014.02.010
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AN - SCOPUS:84899486783
SN - 0022-4049
VL - 218
SP - 1845
EP - 1866
JO - Journal of Pure and Applied Algebra
JF - Journal of Pure and Applied Algebra
IS - 10
ER -