Theorems · Theorem · algebraic topology

ContMDiffWithinAt.sum_section_of_locallyFinite

∀ {𝕜 : Type u_1} [inst : NontriviallyNormedField 𝕜] {E : Type u_2} [inst_1 : NormedAddCommGroup E]
  [inst_2 : NormedSpace 𝕜 E] {H : Type u_3} [inst_3 : TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {M : Type u_4}
  [inst_4 : TopologicalSpace M] [inst_5 : ChartedSpace H M] {F : Type u_5} [inst_6 : NormedAddCommGroup F]
  [inst_7 : NormedSpace 𝕜 F] {n : WithTop ℕ∞} {V : M → Type u_6} [inst_8 : TopologicalSpace (Bundle.TotalSpace F V)]
  [inst_9 : (x : M) → TopologicalSpace (V x)] [inst_10 : FiberBundle F V] [inst_11 : (x : M) → AddCommGroup (V x)]
  [inst_12 : (x : M) → Module 𝕜 (V x)] [VectorBundle 𝕜 F V] {u : Set M} {x₀ : M} {ι : Type u_7} {t : ι → (x : M) → V x},
  (LocallyFinite fun i => {x | t i x ≠ 0}) →
    (∀ (i : ι), ContMDiffWithinAt I (I.prod (modelWithCornersSelf 𝕜 F)) n (fun x => ⟨x, t i x⟩) u x₀) →
      ContMDiffWithinAt I (I.prod (modelWithCornersSelf 𝕜 F)) n (fun x => ⟨x, ∑' (i : ι), t i x⟩) u x₀

The sum of a locally finite collection of sections is C^k iff each section is. Version at a point within a set.

Defined in

Mathlib.Geometry.Manifold.VectorBundle.ContMDiffSection

Cited by

3 results in Mathlib

Foundations

Depth 213 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

NontriviallyNormedFieldNormedAddCommGroupNormedSpaceTopologicalSpaceTopologicalSpaceChartedSpaceNormedAddCommGroupNormedSpaceTopologicalSpaceTopologicalSpaceFiberBundleAddCommGroupModuleVectorBundle