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

Initializing...

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