Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-06-04 13:16 0e943b15

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feat(order/boolean_algebra, set/basic): some compl lemmas (#14508) Added a few lemmas about complementation, and rephrased compl_compl and mem_compl_image to apply in boolean_algebra rather than set (set _ )).

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