Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-03-24 05:18 d4e27d0b

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chore(topology/separation): move a lemma, golf (#12896)

  • move t0_space_of_injective_of_continuous up;
  • add embedding.t0_space, use it for subtype.t0_space.

Estimated changes