[Merged by Bors] - feat(Algebra/Homology): left shifting cochains #9054
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In this PR, we study the behaviour of cochains (of the complex of homomorphisms) with respect to shifts on the source. In particular, we obtain an additive equivalence `leftShiftAddEquiv K L n a n' h : Cochain K L n ≃+ Cochain K⟦a⟧ L n'` when `h : n + a = n'`. Co-authored-by: Joël Riou <37772949+joelriou@users.noreply.github.com>
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In this PR, we study the behaviour of cochains (of the complex of homomorphisms) with respect to shifts on the source. In particular, we obtain an additive equivalence
leftShiftAddEquiv K L n a n' h : Cochain K L n ≃+ Cochain K⟦a⟧ L n'whenh : n + a = n'.This is the left counterpart of #8937