`BookProof.ChapterLaplacianProduct.fderiv_mul_eventually` {f g : E → ℝ} {x : E} (hf : ContDiffAt ℝ 2 f x) (hg : ContDiffAt ℝ 2 g x) : (fderiv ℝ fun y : E => f y * g y) =ᶠ[nhds x] f

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`BookProof.ChapterLaplacianProduct.fderiv_mul_eventually` {f g : E → ℝ} {x : E} (hf : ContDiffAt ℝ 2 f x) (hg : ContDiffAt ℝ 2 g x) : (fderiv ℝ fun y : E => f y * g y) =ᶠ[nhds x] f · Prove2Me