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Commit 2021-05-06 04:31 6af5fbd2

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feat(category_theory/.../zero): if a zero morphism is a mono, the source is zero (#7462) Some simple lemmas about zero morphisms.

Estimated changes

Modified src/category_theory/limits/shapes/zero.lean

added theorem category_theory.limits.has_zero_object.functor.zero_map

added theorem category_theory.limits.has_zero_object.functor.zero_obj

added theorem category_theory.limits.is_iso_of_source_target_iso_zero

added def category_theory.limits.iso_zero_of_epi_zero

added def category_theory.limits.iso_zero_of_mono_zero