Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-06-15 23:36 f991b4d4

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chore(*): Bump to Lean 3.43.0 (#14684) Most of the changes in this upgrade are a consequence of https://github.com/leanprover-community/lean/pull/675, which removed almost all of init/data/set.lean from lean core so it could be migrated to mathlib. Other relevant core changes are https://github.com/leanprover-community/lean/pull/714, which removed a few order decidability instances, and https://github.com/leanprover-community/lean/pull/711, which caused a docstring to be rejected.

Estimated changes

deleted theorem set.compl_eq_compl
added def set.image
modified theorem set.mem_powerset
modified theorem set.mem_powerset_iff
deleted theorem set.mem_set_of_eq
added def set.powerset
modified theorem set.subset_of_mem_powerset