Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-12-02 19:13 0bb88094

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feat(category_theory/limits): left adjoint if preserves colimits (#4942) A slight generalisation of a construction from before. Maybe this is the dual version you were talking about @jcommelin - if so my mistake! I think the advantage of doing it this way is that you definitionally get the old version but also the new version too.

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