`BookProof.ChapterLegendrePolynomial.legendre_deriv_ode` (l μ : ℕ) : (X ^ 2 - 1) * derivative^[2] (derivative^[μ] (legendre l)) + C (2 * (μ : ℝ) + 2) * X * derivative (derivative^[

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`BookProof.ChapterLegendrePolynomial.legendre_deriv_ode` (l μ : ℕ) : (X ^ 2 - 1) * derivative^[2] (derivative^[μ] (legendre l)) + C (2 * (μ : ℝ) + 2) * X * derivative (derivative^[ · Prove2Me