COMMUNICATIONS IN ALGEBRA
Volume 28, Number 4, 2000CONTENTS
Reciprocity Laws for Simple Algebras over Function Fields of
Number Curves . . . 1657 V. I. Guletskil and V. I. Yanchevskii
The Automorphism Group of the Derived Category for a
Weighted Projective L i n e . . . 1685 H. Lenzing and H. Meltzer
Semi-invariants of Actions of Multiplier Hopf A l g e b r a s . . . 1701 L. Delvanx and A. Van Daele
Enumeration of Subgroups in the Fundamental Groups of
Orientable Circle Bundles over Surfaces... 1717 V. Liskovets and A. Mednykh
Picard Groups for Graded Coalgebras . . . 1739 J. Cuadra, J. R. Garcia Rozas, and B. Torrecillas
On the Topology of a Generic Fiber of a Polynomial Function... 1767 E. Artal, I. Luengo, and A. Melle
Irreducible Representations of Finite Exceptional Groups of Lie
Type Containing Matrices with Simple Spectra . . . 1789 I. D. Suprunenko and A. E. Zaiesskii
A Triangularity Result for Associated Varieties of Highest
Weight Modules... 1835 W. M. McGovern
Morphisms of Double Frobenius Algebras. I . . . 1845 M. Koppinen
On the Monotonicity of the Hilbert Function of the Sally
Module . . . 1861 L. Rodriguez Doering and M. Vaz Pinto
On Some Examples of Simple Quantum G r o u p s . . . 1867 C. Hoffman
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viii CONTENTS On Groups with rf-Generator Subgroups of Coprime Index . . . 1875 A. Lucchini
The Trace Formula for Braided Hopf Algebras . . . 1881 Y. Doi
On the Order of the Unitary Subgroup of a Modular Group
A l g e b r a . . . 1897 V. Bovdi and A. L. Rosa
On Generalized Stable Rings . . . 1907 H. Chen
On Quasi-duality M o d u l e s . . . 1919 K. R. Fuller and W. Xue
Computing 2-Cocycles for Central Extensions and Relative
Difference Sets . . . 1939 D. L. Flannery and E. A. 0 'Brien
Near-Dedekind Rings . . . 1957 A. W. Chatters
Normal Ideals of Graded Rings . . . 1971
S. Faridi
Field Theory for the Function Field of the Quintic Fermat
C u r v e . . . 1979 K. Miura and H. Yoshihara
Tresse et Structure Entiere sur la Categoric des Representations
de SL/^ Q u a n t i q u e . . . 1989 A. Bruguieres
Clifford Theory of B i m o d u l e s . . . 2029 A. Marcus
Injective Comodules for 2 x 2 Quantum M a t r i c e s . . . 2043 W. Chin and L. Krop
Symmetric Powers of Modular Representations, Hilbert Series,
and Degree Bounds . . . 2059 /. Hughes and G. Kemper
Lifts of Quantum Groups in Prime Characteristic . . . 2089 A. Brown and R. Fioresi
Arrangements of Ideals in a Commutative Algebra . . . 2097 S. Itoh
