feat(RepresentationTheory/Homological/GroupHomology/Functoriality): low degree functoriality maps#21763
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101damnations wants to merge 211 commits intomasterfrom
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feat(RepresentationTheory/Homological/GroupHomology/Functoriality): low degree functoriality maps#21763101damnations wants to merge 211 commits intomasterfrom
101damnations wants to merge 211 commits intomasterfrom
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added 30 commits
January 22, 2025 14:37
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February 12, 2025 18:50
…-community/mathlib4 into coinvariantsstuff
…mathlib4 into diagonalsuccisohalf
…ommunity/mathlib4 into diagonalsucciso
This was referenced Mar 6, 2025
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Refactored and moved to a fork in #25939. |
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Given a commutative ring
k, a group homomorphismf : G →* H, ak-linearG-representationA, ak-linearH-representationB, and a representation morphismA ⟶ Res(f)(B), we geta chain map
inhomogeneousChains A ⟶ inhomogeneousChains Band hence maps oncohomology
Hₙ(G, A) ⟶ Hₙ(H, B).This PR provides specialised API for these maps in low degree. A future PR will add support for switching resolution.
Action.rhoaMonoidHominstead of a morphism inMonCat#21652Finsupp#21732Rep.diagonal k G (n + 1) ≅ Rep.free k G (Fin n → G)#21736IsOneCyclepredicate and friends #21757groupHomology A nwithHn Aforn = 0, 1, 2#21759