Structure theorems for the heart of LCA

2025/12/03 by Oliver Braunling, Braunling, Oliver, Fei Ren +1 · 1 citation
Mathematics · #Homotopy and Cohomology in Algebraic Topology #Advanced Operator Algebra Research #Advanced Topology and Set Theory

paper · pdf · doi:10.48550/arxiv.2512.03338

Abstract

Cohomology theories with values in LCA (locally compact abelian) groups suffer from the problem that the latter do not form an abelian category. However, the category LCA has a canonical abelian category envelope, the heart of a suitable t-structure. It adds formal cokernel objects. We show the surprising result that these abstract cokernels can also be interpreted as Hausdorff topological abelian groups, at least up to lattice isogenies. These need not be locally compact.

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Cited by

• A homological approach to (Grothendieck's) completeness problem for regular LB-spaces

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