Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-07-28 22:08 2e6c488c

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chore(order/complete_lattice): use Prop args in infi_inf etc (#3611) This way one can rw binfi_inf first, then prove ∃ i, p i. Also move some code up to make it available near infi_inf.

Estimated changes

modified theorem binfi_inf
modified theorem inf_infi
modified theorem infi_inf