Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-02-03 23:36 853192ce

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feat(topology/algebra): Inf and inducing preserve compatibility with algebraic structure (#11720) This partly duplicates @mariainesdff 's work on group topologies, but I'm using an unbundled approach which avoids defining a new X_topology structure for each interesting X.

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