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arXiv · 2607.16446

Solid Duality for Profinite Groups

Ged Corob Cook·Max Gheorghiu·Sofía Marlasca Aparicio·Thomas A. Wasserman
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Abstract

We classify profinite groups that have a Poincar\'e-like duality between their homology and cohomology. Our proofs work over every profinite coefficient ring, and for profinite as well as discrete coefficients. We do not only unify and generalise existing results, but also construct two novel examples of duality groups. We prove our results via the framework of condensed mathematics. This recently developed setting is a natural home for profinite objects, and our work is among the first to leverage this for the study of the (co)homology of profinite groups. Establishing our duality results involves an investigation of homological finiteness properties in condensed mathematics.

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Ged Corob Cook, Max Gheorghiu, Sofía Marlasca Aparicio, Thomas A. Wasserman. 2026-07-17. Solid Duality for Profinite Groups. https://arxiv.org/abs/2607.16446

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