Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-08-19 12:44 1efa3673

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feat(group_action/defs): add missing comp_hom smul instances (#8707) This adds missing smul_comm_class and is_scalar_tower instances about the comp_hom definitions. To resolve unification issues in finding these instances caused by the reducibility of the comp_hom defs, this introduces a semireducible def has_scalar.comp.smul.

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