Depth and transfer maps in the cohomology of groups.
The variety of an indecomposable module is connected.
Depth and the Cohomology of Wreath Products.
Complexity and Multiple Complexes.
Endotrivial modules over groups with quaternion or semi-dihedral Sylow 2-subgroup
Let be a finite group with a Sylow 2-subgroup which is either quaternion or semi-dihedral. Let be an algebraically closed field of characteristic 2. We prove the existence of exotic endotrivial -modules, whose restrictions to are isomorphic to the direct sum of the known exotic endotrivial -modules and some projective modules. This provides a description of the group of endotrivial -modules.
Projective Hilbert A(D)-modules.
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