Products and Duality in Categories with Cofibration and Weak Equivalences, by M. S. Weiss and Bruce Williams

The natural transformation from Wall's L-theory to the Tate cohomology of Z/2 acting on K-theory (which we constructed in earlier papers) commutes with external products. Corollary: the Tate cohomology of Z/2 acting on the K-theory of any ring with involution is a generalized Eilenberg-MacLane spectrum, and it is 4-periodic.

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