COMMUNICATIONS IN ALGEBRA
Volume 30, Number 3, 2002
CONTENTS
Exact and Semisimple Differential Graded Algebras . . . 1053 S. T. Aldrich andJ. R. Garcia Rozas
On the Loewy Length and the Noetherian Dimension of
Artinian M o d u l e s . . . 1077 0. A. S. Karamzadeh and A. R. S. Nejad
Characters of Quantum Groups of Type A . . . 1085 P. H. Hai
n-Coherent R i n g s . . . 1119 S. B. Lee
Some Algebras Similar to the Enveloping Algebra of sl(2) . . . 1127 S. Rueda
Structure Theorems for Pure Semisimple Grothendieck
Locally P i - C a t e g o r i e s . . . 1153 J. L. Garcia and D. Simson
Centralizers on Groups Acting on Trees and Bass' Conjecture . . . 1199
M. Sykiotis
On Automatic Rees Matrix Semigroups . . . 1207
L. Descaico and N. Ruskuc
Modules with Few Types over a Serial Ring and over a
Commutative Priifer Ring . . . 1227 V. Puninskaya
U-Factorizations in Commutative Rings with Zero Divisors . . . 1241 M. Axtell
Global Dimension of Transitive Square-Free Rings ... 1257 B. K. D 'Ambrosia
(continued on inside back cover)
COMMUNICATION IN ALGEBRA, 39(3), (2W2) Contents Continued
Minimal and Maximal Length Involutions in Finite Coxeter
G r o u p s . . . 1273 S. B. Perkins and P. J. Rowley
Generators of Simple Lie Algebras and the Lower Rank of
Some P r o - P G r o u p s . . . 1293 Y. Barnea
The Alperin and Dade Conjectures for the O'Nan and
Rudivalis Simple Groups . . . 1305 J. An and E. A. 0 'Brien
Polytopes for Crystallized Demazure Modules and Extremal
V e c t o r s . . . 1349 T. Nakashima
Infinite Components of an Auslander-Reiten Quiver with Finite
D T r - O r b i t s . . . 1369 P. Malicki
Modules in Which Every Fully Invariant Submodule Is
Essential in a Direct Summand . . . 1395 G. F. Birkenmeier, B. J. Milller, and S. T. Rizvi
Nilpotence in Finitary Groups over Commutative Rings . . . 1417 B. A. F. Wehrfritz
Ga Invariants and Slices . . . 1437 J. K. Deveney and D. R. Finston
The Torsion Theory Cogenerated by M-Small Modules . . . 1449 Y. Talebi and N. Vanaja
Copolyform M o d u l e s . . . 1461 Y. Talebi and N. Vanaja
Equalizers and Flatness Properties of Acts . . . 1475 S. Bulman-Fleming and M. Kilp
Morita Contexts with Many Units . . . 1499 H. Chen
Asymptotic Primes of Delta Closures of Ideals . . . 1513 L. J. RatliffJr. and D. E. Rush
The Lattice Structure of Preradicals . . . 1533 F. Raggi, J. R. Monies, H. Rincon, R. Ferndndez-Alonso,
and C. Signoret
E r r a t a . . . 1545
