Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-12-02 12:47 3e72feb3

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feat(ring_theory/localization): The localization of a localization is a localization. (#10456) Also provides an easy consequence : the map of Spec M⁻¹R ⟶ Spec R is isomorphic on stalks.

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