Solid Duality for Profinite Groups

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

Solid Duality for Profinite Groups

Group Theory 2026-07-17 v1 Algebraic Topology

Authors: Ged Corob Cook , Max Gheorghiu , Sofía Marlasca Aparicio , Thomas A. Wasserman

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.

Cite

@article{arxiv.2607.16446,
  title  = {Solid Duality for Profinite Groups},
  author = {Ged Corob Cook and Max Gheorghiu and Sofía Marlasca Aparicio and Thomas A. Wasserman},
  journal= {arXiv preprint arXiv:2607.16446},
  year   = {2026}
}

Comments

40 pages, comments welcome