Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-05-12 14:24 fa4c0368

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chore(order/complete_lattice,data/set/lattice): move Sup_sUnion (#14077)

  • move Sup_sUnion and Inf_sUnion to data.set.lattice;
  • golf a few proofs.

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