Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-12-20 11:53 b02e2ea1

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feat(group_theory/coset): Embeddings of quotients (#10901) If K ≤ L, then there is an embedding K ⧸ (H.subgroup_of K) ↪ L ⧸ (H.subgroup_of L). Golfed from #9545.

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