feat(RepresentationTheory/Homological/GroupHomology/LowDegree): Identify groupHomology A n with Hn A for n = 0, 1, 2#21759
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101damnations wants to merge 178 commits intomasterfrom
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feat(RepresentationTheory/Homological/GroupHomology/LowDegree): Identify groupHomology A n with Hn A for n = 0, 1, 2#21759101damnations wants to merge 178 commits intomasterfrom
groupHomology A n with Hn A for n = 0, 1, 2#21759101damnations wants to merge 178 commits intomasterfrom
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added 30 commits
January 22, 2025 14:37
added 18 commits
February 12, 2025 18:44
…lib4 into actionmoncat
…mathlib4 into coinvariantsstuffhalf
…-community/mathlib4 into coinvariantsstuff
…mathlib4 into diagonalsuccisohalf
…ommunity/mathlib4 into diagonalsucciso
This was referenced Mar 6, 2025
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This PR has been migrated to a fork-based workflow: #25888 |
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This PR gives isomorphisms between
groupHomology A n(defined as thenth homology of the complex of inhomogeneous chains ofA, whosenth object isGⁿ →₀ A, andHn A(defined more minimally and explicitly) forn = 0, 1, 2. We do the same for cycles.Action.rhoaMonoidHominstead of a morphism inMonCat#21652Finsupp#21732Rep.diagonal k G (n + 1) ≅ Rep.free k G (Fin n → G)#21736IsOneCyclepredicate and friends #21757