ANDY R. MAGID is George Lynn Cross Research Professor of Mathematics at the University of Oklahoma, Norman. The coeditor of two volumes of conference proceedings and the author or coauthor of three books and over 60 research papers, Dr. Magid is a member of the Mathematical Association of America and an officer of the American Mathematical Society. His primary research interests are in abstract algebra, especially the theory of algebraic groups and discrete groups and the applications of the former in the study of the representation theory of the latter. He received the B.A. degree (1966) in mathematics from the University of California at Berkeley and the Ph.D. degree (1969) in mathematics from Northwestern University, Evanston, Illinois.

• Preface -- Contributors -- Daniel Zelinsky: An Appreciation /Andy R. Magid -- The Centralizer on H-Separable Skew Group Rings /Ricardo Alfaro and George Szeto -- Contributions of PI Theory to Azumaya Algebras /S. A. Amitsur -- Cocycles and Right Crossed Products /M. Beattie -- Engel-type Theorems for Lie Color Algebras /Jeffery Bergen and Piotr Grzeszczuk -- Constructing Maximal Commutative Subalgebras of Matrix Rings /William C. Brown -- Galois Extensions over Local Number Rings /Lindsay N. Childs -- Infinite Extensions of Simple Modules over Semisimple Lie Algebras /Randall P. Dahlberg -- Smoothing Coherent Torsion-free Sheaves /Amassa Fauntleroy -- Projective Covers and Quasi-Isomorphisms /Mark A. Goddard -- On Dihedral Algebras and Conjugate Splittings /Darrell E. Haile -- On H-Skew Polynomial Rings and Galois Extensions /Shuichi Ikehara and George Szeto -- Separability and the Jones Polynomial /Lars Kadison -- A Note on Grobner Bases and Reduced Ideals /T. Kambayashi -- Bicomplexes and Galois Cohomology /H. F. Kreimer -- Adjoining Idempotents /Andy R. Magid -- Separable Polynomials and Weak Henseliz.ations /Thomas McKenzie -- Faithful Representations of Lie Algebras over Power Series /Graydon Nelson -- Idealizers of Fractal Ideals in Free Group Algebras /Amnon Rosenmann -- Elements of Trace Zero in Central Simple Algebras /Myriam Rosset and Shmuel Rosset -- Canonical Modules and Factorality of Symmetric Algebras /Aron Simis, Bernd Ulrich, and Wolmer V. Vasconcelos -- Splitting Properties of Extensions of the Wedderburn Principal Theorem /Joseph A. Wehlen -- Index.