Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-10-21 13:35 75316cad

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chore(linear_algebra/basic): a few simp lemmas (#4727)

  • add submodule.nonempty;
  • add @[simp] to submodule.map_id;
  • add submodule.neg_coe, protected submodule.map_neg, and submodule.span_neg.

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