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Commit 2022-04-08 00:26 0719b36a

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feat(category_theory/limits/shapes): isomorphisms of (co)spans (#13216)

Estimated changes

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

added def category_theory.limits.cospan_comp_iso

added theorem category_theory.limits.cospan_comp_iso_app_left

added theorem category_theory.limits.cospan_comp_iso_app_one

added theorem category_theory.limits.cospan_comp_iso_app_right

added def category_theory.limits.cospan_ext

added theorem category_theory.limits.cospan_ext_app_left

added theorem category_theory.limits.cospan_ext_app_one

added theorem category_theory.limits.cospan_ext_app_right

added def category_theory.limits.span_comp_iso

added theorem category_theory.limits.span_comp_iso_app_left

added theorem category_theory.limits.span_comp_iso_app_right

added theorem category_theory.limits.span_comp_iso_app_zero

added def category_theory.limits.span_ext

added theorem category_theory.limits.span_ext_app_left

added theorem category_theory.limits.span_ext_app_one

added theorem category_theory.limits.span_ext_app_right