The Right Braids, Quasi-braided Pre-tensor Categories and General
Yang-Baxter Operators 397 F.Li
Primitive Ideals of Noetherian Down-Up Algebras 443 /. Praton
Deformations of Homotopy Algebras 473 V. Hinich
On the Entrywise Powers of Matrices 495 G. Gorni and H. Tutaj-Gasihska
On Generalizations of PF-Rings 521 J. Chen, N. Ding, and M. F. Yousif
Relev6s d'Isotypies de Sp(4, ¥q) Pour q Impair 535 M. Riss
On Transversality for Quadratic Spaces Over Rings with Many Units 551 /. Diets, A. Micali, and A. Paques
Group Actions on Pretrees and Definability 561 A. A. Ivanov
An Extension of the Irreducibility Criteria of Ehrenfeucht and Tverberg 579 A. P. Singh andS. K. Khanduja
On Nakayama Rings 589 K. Nonomura
The Gorenstein Injective Envelope of the Residue Field of a Local Ring 599 R. G. BelshoffandE. E. Enochs
On Supersolvable Groups and the Nilpotator 609 P. Csorgo and M. Herzog
The Lower Nilradical of an Incidence Ring and Applications to the
Recovery Question 621 E. Spiegel
(continued on inside back cover)
Contents Continued
On Some Theorems of Hirschhorn 629 S. Capparelli
Finite Groups Which Factor as Product of an Alternating Group and a
Symmetric Group 637 M. R. Darafsheh
On the Efficiency of Some Finite Groups 649 G. Havas, M. F. Newman, andE. A. O'Brien
The Number of Homomorphisms from a Finite Group to a General
Linear Group 657 M. W. Liebeck and A. Shalev
On Congruence Subgroups and Units in ZS4 663 R. K. Sharma and S. Gangopadhyay
r
On the Extended Centroid of Prime Associative Superalgebras with
Applications to Superderivations 689 M. Fosner
On the Canonical Map of Smooth Surfaces in IP4 707 Ph. Ellia and C. Folegatti
Representing Idempotents as a Sum of Two Nilpotents of Degree
Four 715 A. Grishkov andS. Sidki
Graded Local Cohomology Modules and Their Associated Primes 727 C. S. him
Outer Inheritance of Simplicity in Jordan Systems 747 J. A. Anquela, T. Cortes, E. Garcia, and K. McCrimmon
Diassociativity in Conjugacy Closed Loops 767 M. K. Kinyon, K. Kunen, andJ. D. Phillips
The Class Group of D\T] for D an Integral Domain and T a
Numerical Semigroup 787 D. F. Anderson and G. W. Chang
Primitive and Non Primitive Finite Semifields 793 /. F. Rita
![The Grothendieck group K(A) of an abelian category A is an abelian group generated by the set {[A]} of symbols [A] of objects of A subject to the relations [A](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==)