Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-05-01 15:16 92b90480

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chore(topology/continuous_function/algebra): put coe_fn_monoid_hom into the continuous_map namespace (#7423) Rather than adding continuous_map. to the definition, this wraps everything in a namespace to make this type of mistake unlikely to happen again. This also adds comp_monoid_hom' to golf a proof.

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