Theorems · Theorem · global analysis

ContMDiffWithinAt.mfderivWithin

∀ {𝕜 : Type u_1} [inst : NontriviallyNormedField 𝕜] {m n : WithTop ℕ∞} {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] {E' : Type u_5} [inst_6 : NormedAddCommGroup E']
  [inst_7 : NormedSpace 𝕜 E'] {H' : Type u_6} [inst_8 : TopologicalSpace H'] {I' : ModelWithCorners 𝕜 E' H'}
  {M' : Type u_7} [inst_9 : TopologicalSpace M'] [inst_10 : ChartedSpace H' M'] {F : Type u_8}
  [inst_11 : NormedAddCommGroup F] [inst_12 : NormedSpace 𝕜 F] {G : Type u_9} [inst_13 : TopologicalSpace G]
  {J : ModelWithCorners 𝕜 F G} {N : Type u_10} [inst_14 : TopologicalSpace N] [inst_15 : ChartedSpace G N]
  [Js : IsManifold J 1 N] [Is : IsManifold I 1 M] [I's : IsManifold I' 1 M'] {x₀ : N} {f : N → M → M'} {g : N → M}
  {t : Set N} {u : Set M},
  ContMDiffWithinAt (J.prod I) I' n (Function.uncurry f) (t ×ˢ u) (x₀, g x₀) →
    ContMDiffWithinAt J I m g t x₀ →
      x₀ ∈ t →
        Set.MapsTo g t u →
          m + 1 ≤ n →
            UniqueMDiff[u] →
              ContMDiffWithinAt J (modelWithCornersSelf 𝕜 (E →L[𝕜] E')) m
                (inTangentCoordinates I I' g (fun x => f x (g x)) (fun x => mfderiv[u] (f x) (g x)) x₀) t x₀

The function that sends x to the y-derivative of f (x, y) at g (x) is C^m at x₀, where the derivative is taken as a continuous linear map. We have to assume that f is C^n at (x₀, g(x₀)) for n ≥ m + 1 and g is C^m at x₀. We have to insert a coordinate change from x₀ to x to make the derivative sensible. Version within a set.

Defined in

Mathlib.Geometry.Manifold.ContMDiffMFDeriv

Cited by

3 results in Mathlib

Foundations

Depth 220 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

NontriviallyNormedFieldNormedAddCommGroupNormedSpaceTopologicalSpaceTopologicalSpaceChartedSpaceNormedAddCommGroupNormedSpaceTopologicalSpaceTopologicalSpaceChartedSpaceNormedAddCommGroupNormedSpaceTopologicalSpaceTopologicalSpaceChartedSpaceIsManifoldIsManifoldIsManifold