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Commit 2021-06-07 15:40 6e675366

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feat(category/limits): kernel.map (#7623) A generalization of a lemma from LTE, stated for a category with (co)kernels.

Estimated changes

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

added def category_theory.limits.parallel_pair_hom

added theorem category_theory.limits.parallel_pair_hom_app_one

added theorem category_theory.limits.parallel_pair_hom_app_zero

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

added def category_theory.limits.cokernel.map

added theorem category_theory.limits.cokernel.map_desc

added theorem category_theory.limits.kernel.lift_map

added def category_theory.limits.kernel.map