[Merged by Bors] - feat(Algebra/Homology): preliminary definitions for the homology sequence#8765
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[Merged by Bors] - feat(Algebra/Homology): preliminary definitions for the homology sequence#8765
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…ence (#8765) As a preliminary step towards the homology sequence, given a homological complex `K` and two degrees `i` and `j` such that `c.Rel i j`, we construct an exact sequence `0 ⟶ K.homology i ⟶ K.opcycles i ⟶ K.cycles j ⟶ K.homology j ⟶ 0`.
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…ence (#8765) As a preliminary step towards the homology sequence, given a homological complex `K` and two degrees `i` and `j` such that `c.Rel i j`, we construct an exact sequence `0 ⟶ K.homology i ⟶ K.opcycles i ⟶ K.cycles j ⟶ K.homology j ⟶ 0`.
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As a preliminary step towards the homology sequence, given a homological complex
Kand two degreesiandjsuch thatc.Rel i j, we construct an exact sequence0 ⟶ K.homology i ⟶ K.opcycles i ⟶ K.cycles j ⟶ K.homology j ⟶ 0.