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Theorem to_prev'_neg

Modification history

2021-05-17 12:38
src/algebra/homology/homotopy.lean
refactor(algebra/homology/homotopy): avoid needing has_zero_object (#7621) …
Deleted to_prev'_negView on Github →
2021-05-15 08:16
src/algebra/homology/homotopy.lean
feat(algebra/homology): homotopies between chain maps (#7483)
Added to_prev'_negView on Github →