`BookProof.WeakSecondDeriv.ae_eq_const_of_integral_deriv_smul_eq_zero` {r : ℝ → F} (hr : LocallyIntegrable r volume) (h : ∀ g : ℝ → ℝ, IsTestFun g → ∫ x, deriv g x • r x = 0) : ∃ c

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`BookProof.WeakSecondDeriv.ae_eq_const_of_integral_deriv_smul_eq_zero` {r : ℝ → F} (hr : LocallyIntegrable r volume) (h : ∀ g : ℝ → ℝ, IsTestFun g → ∫ x, deriv g x • r x = 0) : ∃ c · Prove2Me