Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-12-13 22:30 f1adf6ad

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feat(ring_theory/power_series): X s commutes with any power series Use this fact to golf a proof and generalize order_eq_multiplicity_X from [comm_semiring R] to [semiring R]. Should we redefine order to be multiplicity in all cases?

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