[Merged by Bors] - Add constantCoeff_smul to RingTheory.PowerSeries.Basic #12616
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``` example : (constantCoeff ℝ) ((2:ℝ)•X) = 0 := by simp ``` simp doesn't solve the above because there is no lemma constantCoeff_smul tagged simp. This PR adds it to RingTheory.PowerSeries.Basic. Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
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``` example : (constantCoeff ℝ) ((2:ℝ)•X) = 0 := by simp ``` simp doesn't solve the above because there is no lemma constantCoeff_smul tagged simp. This PR adds it to RingTheory.PowerSeries.Basic. Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
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``` example : (constantCoeff ℝ) ((2:ℝ)•X) = 0 := by simp ``` simp doesn't solve the above because there is no lemma constantCoeff_smul tagged simp. This PR adds it to RingTheory.PowerSeries.Basic. Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
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simp doesn't solve the above because there is no lemma constantCoeff_smul tagged simp. This PR adds it to RingTheory.PowerSeries.Basic.