This is a companion volume to the conference in honor of Donald S. Passman held in Madison, Wisconsin in June 2005. It contains research papers on Algebras, Group Rings, Hopf Algebras, Invariant Theory, Lie Algebras and their Enveloping Algebras, Noncommutative Algebraic Geometry, Noncommutative Rings, and other topics. The papers represent an important part of the latest research in these areas.
Group gradings on associative superalgebras by Y. A. Bahturin and I. P. Shestakov Essential extensions of a direct sum of simple modules by K. I. Beidar, S. K. Jain, and A. K. Srivastava Adjoint actions of cocommutative Hopf algebras by J. Bergen Two statements about infinite products that are not quite true by G. M. Bergman Cyclic structures with lag-time generators by R. Betz, S. Eckel, P. Pappas, and J. Uyanik Central idempotents in group algebras by O. B. Cristo and C. P. Milies Congruence subgroups and the Atiyah conjecture by D. R. Farkas and P. A. Linnell The adjoint of the Bezoutian by E. Formanek Group algebras whose Lie algebra of skew-symmetric elements is nilpotent by A. Giambruno and S. K. Sehgal Free symmetric and unitary pairs in central simple algebras with involution by J. Z. Goncalves and M. Shirvani Orders of finite groups of matrices by R. M. Guralnick and M. Lorenz Passman's problem on adjoint representations by G. Heide and A. E. Zalesskii On the modular isomorphism problem: Groups of order $2^6$ by M. Hertweck and M. Soriano On the prime graph of the unit group of integral group rings of finite groups by W. Kimmerle Simple modules for the Drinfel'd double of a class of Hopf algebras by L. Krop and D. E. Radford The correspondence between groups and restricted Lie algebras for some relatively free groups by A. I. Lichtman Semiprime Lie rings of derivations of commutative rings by C.-H. Liu Faithful cyclic modules for enveloping algebras and Sklyanin algebras by I. M. Musson Polynomial and inverse forms by D. S. Passman Restricted Lie algebras with subexponential growth by D. Riley and H. Usefi A few criteria of boundedness of topological rings by M. Ursul.