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Mathlib.Geometry.Manifold.Algebra.LeftInvariantDerivation

Left invariant derivations #

In this file we define the concept of left invariant derivation for a Lie group. The concept is analogous to the more classical concept of left invariant vector fields, and it holds that the derivation associated to a vector field is left invariant iff the field is.

Moreover we prove that LeftInvariantDerivation I G has the structure of a Lie algebra, hence implementing one of the possible definitions of the Lie algebra attached to a Lie group.

structure LeftInvariantDerivation {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] (I : ModelWithCorners 𝕜 E H) (G : Type u_4) [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] extends Derivation :
Type (max u_1 u_4)

Left-invariant global derivations.

A global derivation is left-invariant if it is equal to its pullback along left multiplication by an arbitrary element of G.

Instances For
    theorem LeftInvariantDerivation.toDerivation_injective {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] :
    Function.Injective LeftInvariantDerivation.toDerivation
    theorem LeftInvariantDerivation.toFun_eq_coe {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] {X : LeftInvariantDerivation I G} :
    X.toFun = ⇑X
    theorem LeftInvariantDerivation.coe_injective {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] :
    Function.Injective DFunLike.coe
    theorem LeftInvariantDerivation.ext {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] {X : LeftInvariantDerivation I G} {Y : LeftInvariantDerivation I G} (h : ∀ (f : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤), X f = Y f) :
    X = Y
    theorem LeftInvariantDerivation.coe_derivation {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) :
    ⇑↑X = ⇑X
    theorem LeftInvariantDerivation.left_invariant' {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (g : G) (X : LeftInvariantDerivation I G) :

    Premature version of the lemma. Prefer using left_invariant instead.

    theorem LeftInvariantDerivation.map_add {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) (f : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤) {f' : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤} :
    X (f + f') = X f + X f'
    theorem LeftInvariantDerivation.map_zero {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) :
    X 0 = 0
    theorem LeftInvariantDerivation.map_neg {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) (f : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤) :
    X (-f) = -X f
    theorem LeftInvariantDerivation.map_sub {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) (f : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤) {f' : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤} :
    X (f - f') = X f - X f'
    theorem LeftInvariantDerivation.map_smul {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] {r : 𝕜} (X : LeftInvariantDerivation I G) (f : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤) :
    X (r • f) = r • X f
    @[simp]
    theorem LeftInvariantDerivation.leibniz {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) (f : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤) {f' : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤} :
    X (f * f') = f • X f' + f' • X f
    Equations
    • LeftInvariantDerivation.instZeroLeftInvariantDerivation = { zero := { toDerivation := 0, left_invariant'' := ⋯ } }
    Equations
    • LeftInvariantDerivation.instInhabitedLeftInvariantDerivation = { default := 0 }
    Equations
    • LeftInvariantDerivation.instAddLeftInvariantDerivation = { add := fun (X Y : LeftInvariantDerivation I G) => { toDerivation := ↑X + ↑Y, left_invariant'' := ⋯ } }
    Equations
    • LeftInvariantDerivation.instNegLeftInvariantDerivation = { neg := fun (X : LeftInvariantDerivation I G) => { toDerivation := -↑X, left_invariant'' := ⋯ } }
    Equations
    • LeftInvariantDerivation.instSubLeftInvariantDerivation = { sub := fun (X Y : LeftInvariantDerivation I G) => { toDerivation := ↑X - ↑Y, left_invariant'' := ⋯ } }
    @[simp]
    theorem LeftInvariantDerivation.coe_add {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) (Y : LeftInvariantDerivation I G) :
    ⇑(X + Y) = ⇑X + ⇑Y
    @[simp]
    theorem LeftInvariantDerivation.coe_zero {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] :
    ⇑0 = 0
    @[simp]
    theorem LeftInvariantDerivation.coe_neg {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) :
    ⇑(-X) = -⇑X
    @[simp]
    theorem LeftInvariantDerivation.coe_sub {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) (Y : LeftInvariantDerivation I G) :
    ⇑(X - Y) = ⇑X - ⇑Y
    @[simp]
    theorem LeftInvariantDerivation.lift_add {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) (Y : LeftInvariantDerivation I G) :
    ↑(X + Y) = ↑X + ↑Y
    @[simp]
    theorem LeftInvariantDerivation.lift_zero {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] :
    ↑0 = 0
    Equations
    • LeftInvariantDerivation.hasNatScalar = { smul := fun (r : ℕ) (X : LeftInvariantDerivation I G) => { toDerivation := r • ↑X, left_invariant'' := ⋯ } }
    Equations
    • LeftInvariantDerivation.hasIntScalar = { smul := fun (r : ℤ) (X : LeftInvariantDerivation I G) => { toDerivation := r • ↑X, left_invariant'' := ⋯ } }
    Equations
    Equations
    • LeftInvariantDerivation.instSMulLeftInvariantDerivation = { smul := fun (r : 𝕜) (X : LeftInvariantDerivation I G) => { toDerivation := r • ↑X, left_invariant'' := ⋯ } }
    @[simp]
    theorem LeftInvariantDerivation.coe_smul {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (r : 𝕜) (X : LeftInvariantDerivation I G) :
    ⇑(r • X) = r • ⇑X
    @[simp]
    theorem LeftInvariantDerivation.lift_smul {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) (k : 𝕜) :
    ↑(k • X) = k • ↑X
    @[simp]

    The coercion to function is a monoid homomorphism.

    Equations
    Instances For

      Evaluation at a point for left invariant derivation. Same thing as for generic global derivations (Derivation.evalAt).

      Equations
      Instances For
        theorem LeftInvariantDerivation.evalAt_apply {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (g : G) (X : LeftInvariantDerivation I G) (f : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤) :
        theorem LeftInvariantDerivation.comp_L {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (g : G) (X : LeftInvariantDerivation I G) (f : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤) :
        Equations
        • LeftInvariantDerivation.instBracketLeftInvariantDerivation = { bracket := fun (X Y : LeftInvariantDerivation I G) => { toDerivation := ⁅↑X, ↑Y⁆, left_invariant'' := ⋯ } }
        @[simp]
        theorem LeftInvariantDerivation.commutator_apply {𝕜 : Type u_1} [NontriviallyNormedField 𝕜] {E : Type u_2} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type u_3} [TopologicalSpace H] {I : ModelWithCorners 𝕜 E H} {G : Type u_4} [TopologicalSpace G] [ChartedSpace H G] [Monoid G] [SmoothMul I G] (X : LeftInvariantDerivation I G) (Y : LeftInvariantDerivation I G) (f : ContMDiffMap I (modelWithCornersSelf 𝕜 𝕜) G 𝕜 ⊤) :
        ⁅X, Y⁆ f = X (Y f) - Y (X f)
        Equations
        • LeftInvariantDerivation.instLieRingLeftInvariantDerivation = LieRing.mk ⋯ ⋯ ⋯ ⋯
        Equations
        • LeftInvariantDerivation.instLieAlgebraLeftInvariantDerivationToCommRingToEuclideanDomainToFieldToNormedFieldInstLieRingLeftInvariantDerivation = LieAlgebra.mk ⋯