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Commit 2021-05-05 23:47 19b752c4

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feat(category_theory/preadditive): reformulation of mono_of_kernel_zero (#7464)

Estimated changes

Modified src/category_theory/preadditive/default.lean

added theorem category_theory.preadditive.epi_of_cokernel_iso_zero

modified theorem category_theory.preadditive.epi_of_cokernel_zero

added theorem category_theory.preadditive.mono_of_kernel_iso_zero