Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-06-09 06:11 393f6389

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feat(ring_theory/localization): Make local_ring_hom more flexible (#7787) Make localization.local_ring_hom more flexible, by allowing two ideals I and J as arguments, with the assumption that I equals ideal.comap f J. Also add lemmas about identity and composition.

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