Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-12-03 14:32 8bb26a72

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chore(*): protect to_fun and map_{add,zero,mul,one,div} (#10580) This PR prepares for #9888 by namespacing all usages of to_fun and map_{add,zero,mul,one,div} that do not involve the classes of #9888. This includes e.g. polynomial.map_add and multiset.map_add, which involve polynomial.map and multiset.map respectively.

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