[Merged by Bors] - feat(category_theory/.../zero): if a zero morphism is a mono, the source is zero #7462
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Co-authored-by: Johan Commelin <johan@commelin.net>
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…rce is zero (#7462) Some simple lemmas about zero morphisms. Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
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…rce is zero (#7462) Some simple lemmas about zero morphisms. Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
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…rce is zero (#7462) Some simple lemmas about zero morphisms. Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
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…rce is zero (#7462) Some simple lemmas about zero morphisms. Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
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Some simple lemmas about zero morphisms.
Prerequisites PR for the new homology design / projective resolutions / derived functors.