Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-12-21 23:32 fc66d88c

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refactor(ring_theory/derivation): use weaker TC assumptions (#10952) Don't assume [add_cancel_comm_monoid M], add map_one_eq_zero as an axiom instead. Add a constructor derivation.mk' that deduces map_one_eq_zero from leibniz. Also generalize smul/module instances.

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