Theorems · Theorem · real analysis

HasDerivWithinAt.fun_finsetProd

∀ {𝕜 : Type u} [inst : NontriviallyNormedField 𝕜] {x : 𝕜} {s : Set 𝕜} {ι : Type u_2} [inst_1 : DecidableEq ι]
  {𝔸' : Type u_3} [inst_2 : NormedCommRing 𝔸'] [inst_3 : NormedAlgebra 𝕜 𝔸'] {u : Finset ι} {f : ι → 𝕜 → 𝔸'}
  {f' : ι → 𝔸'},
  (∀ i ∈ u, HasDerivWithinAt (f i) (f' i) s x) →
    HasDerivWithinAt (fun x => ∏ i ∈ u, f i x) (∑ i ∈ u, (∏ j ∈ u.erase i, f j x) • f' i) s x

Defined in

Mathlib.Analysis.Calculus.Deriv.Mul

Cited by

4 results in Mathlib

Foundations

Depth 188 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

NontriviallyNormedFieldDecidableEqNormedCommRingNormedAlgebra