Abstract
We remark that a very short proof of an elementary result concerning cohomological periods is implicit in the existing literature. As a corollary we show that given a finitely generated stably free resolution of the integers over a finite group, two of its modules are free.
Citation
W.H. Mannan. "Periodic cohomology." Homology Homotopy Appl. 10 (2) 135 - 137, 2008.
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