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Commit 2022-07-20 11:04 dcb4b68a

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feat(category_theory/shapes/pullbacks): Pullbacks isomorphic to the opposite of pushouts (#15455)

Estimated changes

Modified src/category_theory/limits/opposites.lean

added def category_theory.limits.pullback_iso_unop_pushout

added theorem category_theory.limits.pullback_iso_unop_pushout_hom_inl

added theorem category_theory.limits.pullback_iso_unop_pushout_hom_inr

added theorem category_theory.limits.pullback_iso_unop_pushout_inv_fst

added theorem category_theory.limits.pullback_iso_unop_pushout_inv_snd

added def category_theory.limits.pushout_iso_unop_pullback

added theorem category_theory.limits.pushout_iso_unop_pullback_inl_hom

added theorem category_theory.limits.pushout_iso_unop_pullback_inr_hom

added theorem category_theory.limits.pushout_iso_unop_pullback_inv_fst

added theorem category_theory.limits.pushout_iso_unop_pullback_inv_snd

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

added theorem category_theory.limits.pullback_cone.fst_colimit_cocone

added theorem category_theory.limits.pullback_cone.snd_colimit_cocone

added theorem category_theory.limits.pullback_cone.π_app_left

added theorem category_theory.limits.pullback_cone.π_app_right

added theorem category_theory.limits.pushout_cocone.inl_colimit_cocone

added theorem category_theory.limits.pushout_cocone.inr_colimit_cocone

added theorem category_theory.limits.pushout_cocone.ι_app_left

added theorem category_theory.limits.pushout_cocone.ι_app_right