Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-02-18 18:09 018c7289

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refactor(ring_theory/fractional_ideal): rename lemmas for dot notation, add coe_pow (#12080) This replaces fractional_ideal.fractional_mul with is_fractional.mul and likewise for the other operations. The bundling was a distraction for the content of the lemmas anyway.

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