`BookProof.WeakSecondDeriv.integral_eq_neg_integral_coord_mul_deriv` {g : ℝ → ℝ} (h : IsTestFun g) : ∫ x, g x = -∫ x, x * deriv g x

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`BookProof.WeakSecondDeriv.integral_eq_neg_integral_coord_mul_deriv` {g : ℝ → ℝ} (h : IsTestFun g) : ∫ x, g x = -∫ x, x * deriv g x · Prove2Me