We investigate the transfer of the Cohen-Macaulay property from a commutative
ring to a subring of invariants under the action of a finite group. Our point
of view is ring theoretic and not a priori tailored to a particular type of
group action. As an illustration, we briefly discuss the special case of
multiplicative actions, that is, actions on group algebras $k[\bbZ^n]$ via an
action on $\bbZ^n$.Comment: 15 pages, LaTeX with xypi

Lorenz, Martin

Pathak, Jawahar