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The Becker--Gottlieb transfer is not functorial: An example based on units of group rings

Georg Lehner, Cary Malkiewich, Florian Naef

math.ATarXiv:2610.18720

Abstract

We show by explicit counterexample that the Becker--Gottlieb transfer cannot be made functorial. A different counterexample using rational homotopy theory was discovered concurrently by the third author and Robin Stoll.

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