most citedBounded cohomology is not a profinite invariant

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math.GR2023★ 2 cited

Bounded cohomology is not a profinite invariant

Daniel Echtler, Holger Kammeyer

We construct pairs of residually finite groups with isomorphic profinite completions such that one has non-vanishing and the other has vanishing real second bounded cohomology. The…