`BookProof.ChapterLegendrePolynomial.legendre_deriv_coeff_top_ne_zero` (l μ : ℕ) (h : μ ≤ l) : (derivative^[μ] (legendre l)).coeff (l

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`BookProof.ChapterLegendrePolynomial.legendre_deriv_coeff_top_ne_zero` (l μ : ℕ) (h : μ ≤ l) : (derivative^[μ] (legendre l)).coeff (l - μ) ≠ 0 · Prove2Me