Contents
Preface
Biography of D. S. Passman
Group Gradings on Associative Superalgebras
Y.
A. BAHTURIN and
I.
P. SHESTAKOV
Essential Extensions of a Direct Sum of Simple Modules
K.
I.
BEIDAR, S. K. JAIN, and AsHISH K. SRIVASTAVA
Adjoint Actions of Cocommutative Hopf Algebras
JEFFREY BERGEN
Two Statements about Infinite Products that Are Not Quite True
GEORGE M. BERGMAN
Cyclic Structures with Lag-Time Generators
RACHEL BETZ, SANDRAH ECKEL, PETER PAPPAS,
and JENNIFER UYANIK
Central Idempotents in Group Algebras
0.
BROCHE CRISTO and C. POLCINO MILIES
Congruence Subgroups and the Atiyah Conjecture
DANIEL R. FARKAS and PETER
A.
LINNELL
The Adjoint of the Bezoutian
EDWARD FORMANEK
Group Algebras Whose Lie Algebra of Skew-Symmetric Elements Is Nilpotent
vii
ix
1
15
25
35
59
75
89
103
A. GIAMBRUNO and S.
K.
SEHGAL 113
Free Symmetric and Unitary Pairs in Central Simple Algebras with Involution
J. Z. GONQALVES and M. SHIRVANI 121
Orders of Finite Groups of Matrices
RoBERT M. GuRALNICK and MARTIN LORENZ
Passman's Problem on Adjoint Representations
G. HEIDE and A. E. ZALESSKII
On the Modular Isomorphism Problem: Groups of Order 26
MARTIN HERTWECK and MARCOS SORIANO
141
163
177
On the Prime Graph of the Unit Group of Integral Group Rings of Finite Groups
W. KIMMERLE 215
v
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