Theorems · Theorem · real analysis

ContDiffWithinAt.add

∀ {𝕜 : Type u_1} [inst : NontriviallyNormedField 𝕜] {E : Type uE} [inst_1 : NormedAddCommGroup E]
  [inst_2 : NormedSpace 𝕜 E] {F : Type uF} [inst_3 : NormedAddCommGroup F] [inst_4 : NormedSpace 𝕜 F] {x : E}
  {n : WithTop ℕ∞} {s : Set E} {f g : E → F},
  ContDiffWithinAt 𝕜 n f s x → ContDiffWithinAt 𝕜 n g s x → ContDiffWithinAt 𝕜 n (fun x => f x + g x) s x

The sum of two C^n functions within a set at a point is C^n within this set at this point.

Defined in

Mathlib.Analysis.Calculus.ContDiff.Operations

Cited by

7 results in Mathlib

Foundations

Depth 200 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

NontriviallyNormedFieldNormedAddCommGroupNormedSpaceNormedAddCommGroupNormedSpace