Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-05-02 13:45 52a454af

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feat(category_theory/limits): pushouts and pullbacks in the opposite category (#13495) This PR adds duality isomorphisms for the categories wide_pushout_shape, wide_pullback_shape, walking_span, walking_cospan and produce pullbacks/pushouts in the opposite category when pushouts/pullbacks exist.

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