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import Mathlib
import OAI.RepresentationTheory.VertexAlgebra.HilbertCore
namespace OAI
/-! Vertex algebra, energy bounds and closed smeared-field operators. -/
noncomputable section
namespace StronglyRationalVOA
universe u v
open Filter
open scoped ContDiff
section GraphData
variable {H : Type u} [NormedAddCommGroup H] [InnerProductSpace ℂ H] [CompleteSpace H]
namespace ClosedGraphData
theorem entry_commutes_of_graph_invariant
(T : H →ₗ.[ℂ] H) (hT : T.IsClosed) (Q : H →L[ℂ] H)
(hQ : ∀ x y : H, (x,y) ∈ T.graph → (Q x,Q y) ∈ T.graph)
(hQa : ∀ x y : H, (x,y) ∈ T.graph → (Q.adjoint x,Q.adjoint y) ∈ T.graph)
(i j : Bool) : Q * entry T hT i j = entry T hT i j * Q := by
have hinv : ∀ z ∈ graph T, diagonalAction Q z ∈ graph T := by
intro z hz
exact hQ _ _ hz
have hinva : ∀ z ∈ graph T, (diagonalAction Q).adjoint z ∈ graph T := by
rw [diagonalAction_adj]
intro z hz
exact hQa _ _ hz
let : IsClosed (graph T : Set (Double H)) := graph_closed hT
have hP : (diagonalAction Q).comp (projection T hT) =
(projection T hT).comp (diagonalAction Q) :=
commutes_projection_of_reduces (graph T) (diagonalAction Q) hinv hinva
change Q.comp (entry T hT i j) = (entry T hT i j).comp Q
have hc : Q.comp (coordinate i) = (coordinate i).comp (diagonalAction Q) :=
(coordinate_diagonalAction Q i).symm
calc
Q.comp (entry T hT i j) =
((coordinate i).comp (diagonalAction Q)).comp ((projection T hT).comp (inclusion j)) := by
rw [← hc]; rfl
_ = (coordinate i).comp (((projection T hT).comp (diagonalAction Q)).comp (inclusion j)) := by
simpa only [ContinuousLinearMap.comp_assoc] using
congrArg (fun R => (coordinate i).comp (R.comp (inclusion j))) hP
_ = (entry T hT i j).comp Q := by
simp only [ContinuousLinearMap.comp_assoc, diagonalAction_inclusion, entry]
end ClosedGraphData
namespace LocalOperatorAlgebra
open scoped Pointwise
def generated (s : Set (H →L[ℂ] H)) : VonNeumannAlgebra H where
toStarSubalgebra := StarSubalgebra.centralizer ℂ (StarSubalgebra.centralizer ℂ s : Set (H →L[ℂ] H))
centralizer_centralizer' := by
change Set.centralizer (Set.centralizer
(StarSubalgebra.centralizer ℂ (StarSubalgebra.centralizer ℂ s : Set (H →L[ℂ] H)) : Set (H →L[ℂ] H))) =
(StarSubalgebra.centralizer ℂ (StarSubalgebra.centralizer ℂ s : Set (H →L[ℂ] H)) : Set (H →L[ℂ] H))
rw [StarSubalgebra.coe_centralizer_centralizer]
rw [Set.centralizer_centralizer_centralizer]
theorem subset_generated (s : Set (H →L[ℂ] H)) : s ⊆ generated s := by
intro x hx
exact StarAlgebra.adjoin_le_centralizer_centralizer ℂ s
(StarAlgebra.subset_adjoin ℂ s hx)
theorem generated_mono {s t : Set (H →L[ℂ] H)} (hst : s ⊆ t) :
generated s ≤ generated t :=
StarSubalgebra.centralizer_le _ _ _ (StarSubalgebra.centralizer_le _ _ _ hst)
theorem generated_le {s : Set (H →L[ℂ] H)} {M : VonNeumannAlgebra H}
(h : s ⊆ M) : generated s ≤ M := by
have hle := StarSubalgebra.centralizer_le ℂ _ _ (StarSubalgebra.centralizer_le ℂ _ _ h)
change (StarSubalgebra.centralizer ℂ (StarSubalgebra.centralizer ℂ s : Set (H →L[ℂ] H)) : Set (H →L[ℂ] H)) ⊆ _
change (StarSubalgebra.centralizer ℂ (StarSubalgebra.centralizer ℂ s : Set (H →L[ℂ] H)) : Set (H →L[ℂ] H)) ⊆
(StarSubalgebra.centralizer ℂ (StarSubalgebra.centralizer ℂ (M : Set (H →L[ℂ] H)) : Set (H →L[ℂ] H)) : Set (H →L[ℂ] H)) at hle
simpa only [StarSubalgebra.coe_centralizer_centralizer,
StarMemClass.star_coe_eq, Set.union_self, M.centralizer_centralizer] using hle
@[simp]
theorem coe_generated_commutant (s : Set (H →L[ℂ] H)) :
((generated s).commutant : Set (H →L[ℂ] H)) = (s ∪ star s).centralizer := by
rw [VonNeumannAlgebra.coe_commutant]
change Set.centralizer (StarSubalgebra.centralizer ℂ
(StarSubalgebra.centralizer ℂ s : Set (H →L[ℂ] H)) : Set (H →L[ℂ] H)) = _
rw [StarSubalgebra.coe_centralizer_centralizer,
Set.centralizer_centralizer_centralizer]
theorem generated_le_commutant_iff (s t : Set (H →L[ℂ] H)) :
generated s ≤ (generated t).commutant ↔
∀ x ∈ s, ∀ y ∈ t, y*x = x*y ∧ star y*x = x*star y := by
constructor
· intro h x hx y hy
have hmem := h (subset_generated s hx)
rw [← SetLike.mem_coe, coe_generated_commutant] at hmem
exact ⟨hmem y (Set.mem_union_left _ hy),
hmem (star y) (Set.mem_union_right _ (by simpa using hy))⟩
· intro h
apply generated_le
intro x hx
rw [coe_generated_commutant]
rintro y (hy | hy)
· exact (h x hx y hy).1
· have hy' : star y ∈ t := hy
simpa using (h x hx (star y) hy').2
end LocalOperatorAlgebra
end GraphData
namespace SmoothCircleFunction
def onCircle (f : SmoothCircleFunction) : AddCircle (2*Real.pi) → ℂ :=
f.periodic.lift
@[simp]
theorem onCircle_coe (f : SmoothCircleFunction) (t : ℝ) :
f.onCircle (t : AddCircle (2*Real.pi)) = f.toFun t := rfl
end SmoothCircleFunction
structure ProperCircleArc where
left : ℝ
right : ℝ
nonempty' : left < right
nondense' : right < left + 2*Real.pi
namespace ProperCircleArc
def carrier (I : ProperCircleArc) : Set (AddCircle (2*Real.pi)) :=
(fun t : ℝ => (t : AddCircle (2*Real.pi))) '' Set.Ioo I.left I.right
def complement (I : ProperCircleArc) : ProperCircleArc where
left := I.right
right := I.left + 2*Real.pi
nonempty' := I.nondense'
nondense' := by linarith [I.nonempty']
end ProperCircleArc
namespace CFTTypeVOA.UnitaryStructure
open UniformSpace
variable {V : Type u} [NormedAddCommGroup V] [InnerProductSpace ℂ V]
{A : CFTTypeVOA V} (U : A.UnitaryStructure)
def localGraphData (hc : A.toVertexAlgebra.C2Cofinite)
(O : Set (AddCircle (2*Real.pi))) : Set (Completion V →L[ℂ] Completion V) :=
{x | ∃ (a : V) (d : ℕ) (ha : a ∈ A.grade d) (f : SmoothCircleFunction),
tsupport f.onCircle ⊆ O ∧ ∃ i j : Bool,
x = ClosedGraphData.entry (U.closedSmoothField hc a d f)
(U.closedSmoothField_isClosed hc ha f) i j}
def localAlgebra (hc : A.toVertexAlgebra.C2Cofinite)
(O : Set (AddCircle (2*Real.pi))) : VonNeumannAlgebra (Completion V) :=
LocalOperatorAlgebra.generated (U.localGraphData hc O)
def intervalAlgebra (hc : A.toVertexAlgebra.C2Cofinite)
(I : ProperCircleArc) : VonNeumannAlgebra (Completion V) :=
U.localAlgebra hc I.carrier
def CKLWStrongLocal (hc : A.toVertexAlgebra.C2Cofinite) : Prop :=
(∀ a : V, A.PolynomialEnergyBound a) ∧
∀ I : ProperCircleArc, U.intervalAlgebra hc I ≤
(U.intervalAlgebra hc I.complement).commutant
theorem localAlgebra_isotone (hc : A.toVertexAlgebra.C2Cofinite)
{O P : Set (AddCircle (2*Real.pi))} (hOP : O ⊆ P) :
U.localAlgebra hc O ≤ U.localAlgebra hc P := by
apply LocalOperatorAlgebra.generated_mono
rintro x ⟨a,d,ha,f,hf,i,j,rfl⟩
exact ⟨a,d,ha,f,hf.trans hOP,i,j,rfl⟩
theorem closedSmoothField_graphData_mem (hc : A.toVertexAlgebra.C2Cofinite)
{a : V} {d : ℕ} (ha : a ∈ A.grade d) (f : SmoothCircleFunction)
{O : Set (AddCircle (2*Real.pi))} (hf : tsupport f.onCircle ⊆ O) (i j : Bool) :
ClosedGraphData.entry (U.closedSmoothField hc a d f)
(U.closedSmoothField_isClosed hc ha f) i j ∈ U.localAlgebra hc O :=
LocalOperatorAlgebra.subset_generated _ ⟨a,d,ha,f,hf,i,j,rfl⟩
theorem CKLWStrongLocal_iff_graphData (hc : A.toVertexAlgebra.C2Cofinite) :
U.CKLWStrongLocal hc ↔
∀ I : ProperCircleArc, ∀ x ∈ U.localGraphData hc I.carrier,
∀ y ∈ U.localGraphData hc I.complement.carrier, y*x=x*y := by
constructor
· intro h I x hx y hy
exact ((LocalOperatorAlgebra.generated_le_commutant_iff _ _).mp (h.2 I) x hx y hy).1
· intro h
refine ⟨U.polynomialEnergyBounds hc, fun I => ?_⟩
apply (LocalOperatorAlgebra.generated_le_commutant_iff _ _).mpr
intro x hx y hy
refine ⟨h I x hx y hy, ?_⟩
apply h I x hx (star y)
obtain ⟨a,d,ha,f,hf,i,j,rfl⟩ := hy
exact ⟨a,d,ha,f,hf,j,i,ClosedGraphData.star_entry _ _ i j⟩
end CFTTypeVOA.UnitaryStructure
namespace CFTTypeVOA.UnitaryStructure
open UniformSpace
variable {V : Type u} [NormedAddCommGroup V] [InnerProductSpace ℂ V]
{A : CFTTypeVOA V} (U : A.UnitaryStructure)
def gradeEmbedding (d : ℕ) : A.grade d →ₗᵢ[ℂ] Completion V :=
(Completion.toComplₗᵢ : V →ₗᵢ[ℂ] Completion V).comp (A.grade d).subtypeₗᵢ
include U in
theorem completed_grades_orthogonal :
OrthogonalFamily ℂ (fun d => A.grade d) (fun d => gradeEmbedding (A := A) d) := by
intro d e hde a b
change inner ℂ ((Completion.toComplₗᵢ : V →ₗᵢ[ℂ] Completion V) a.val)
((Completion.toComplₗᵢ : V →ₗᵢ[ℂ] Completion V) b.val) = 0
rw [LinearIsometry.inner_map_map]
exact U.grades_orthogonal hde a.property b.property
include U in
theorem completed_isHilbertSum :
IsHilbertSum ℂ (fun d => A.grade d) (fun d => gradeEmbedding (A := A) d) := by
classical
let : ∀ d, FiniteDimensional ℂ (A.grade d) := A.grade_finite
apply IsHilbertSum.mk U.completed_grades_orthogonal
let S := ⨆ d, LinearMap.range (gradeEmbedding (A := A) d).toLinearMap
have hcore : HilbertCore.space V ≤ S := by
rintro _ ⟨a, rfl⟩
rw [← A.sum_gradeComponents a, map_sum]
apply Submodule.sum_mem
intro d _
apply Submodule.mem_iSup_of_mem d
exact ⟨⟨A.gradeComponent d a, A.gradeComponent_mem d a⟩, rfl⟩
have hd : Dense (S : Set (Completion V)) := HilbertCore.dense.mono hcore
exact le_of_eq (Submodule.dense_iff_topologicalClosure_eq_top.mp hd).symm
def energyCoordinates : Completion V ≃ₗᵢ[ℂ] lp (fun d => A.grade d) 2 :=
U.completed_isHilbertSum.linearIsometryEquiv
@[simp]
theorem energyCoordinates_grade {d : ℕ} (a : A.grade d) :
U.energyCoordinates (a.val : Completion V) = lp.single 2 d a := by
apply U.energyCoordinates.symm.injective
rw [LinearIsometryEquiv.symm_apply_apply]
exact (U.completed_isHilbertSum.linearIsometryEquiv_symm_apply_single a).symm
theorem energyCoordinates_coe (a : V) (d : ℕ) :
(U.energyCoordinates (a : Completion V) d).val = A.gradeComponent d a := by
apply A.homogeneous_induction (P := fun a =>
(U.energyCoordinates (a : Completion V) d).val = A.gradeComponent d a)
· change (U.energyCoordinates ((Completion.toComplₗᵢ : V →ₗᵢ[ℂ] Completion V) 0) d).val = _
rw [map_zero, map_zero]
simp only [map_zero, lp.coeFn_zero, Pi.zero_apply, Submodule.coe_zero]
· intro e b hb
rw [energyCoordinates_grade U ⟨b,hb⟩]
by_cases hed : e = d
· subst e
simp [A.gradeComponent_of_mem hb]
· simp [lp.single_apply, Ne.symm hed, A.gradeComponent_of_mem_ne hed hb]
· intro b c hb hc
change (U.energyCoordinates ((Completion.toComplₗᵢ : V →ₗᵢ[ℂ] Completion V) (b+c)) d).val = _
simp only [map_add, lp.coeFn_add, Pi.add_apply, Submodule.coe_add]
change (U.energyCoordinates (b : Completion V) d).val +
(U.energyCoordinates (c : Completion V) d).val = _
rw [hb,hc]
end CFTTypeVOA.UnitaryStructure
open scoped ENNReal
namespace HilbertScale
variable {ι : Type*} {G : ι → Type u} [∀ i, NormedAddCommGroup (G i)]
[∀ i, InnerProductSpace ℂ (G i)]
abbrev Space (G : ι → Type u) [∀ i, NormedAddCommGroup (G i)] := lp G 2
def domain (w : ι → ℂ) : Submodule ℂ (Space G) where
carrier := {x | Memℓp (fun i => w i • x i) 2}
zero_mem' := by
change Memℓp (fun i => w i • (0 : G i)) 2
simpa only [smul_zero] using (zero_mem_ℓp' (E := G) (p := 2))
add_mem' := by
intro x y hx hy
change Memℓp (fun i => w i • (x i + y i)) 2
convert hx.add hy using 1
ext i
exact smul_add _ _ _
smul_mem' := by
intro c x hx
change Memℓp (fun i => w i • (c • x i)) 2
convert hx.const_smul c using 1
ext i
exact smul_comm _ _ _
def diagonal (w : ι → ℂ) : Space G →ₗ.[ℂ] Space G where
domain := domain w
toFun :=
{ toFun := fun x => ⟨fun i => w i • x.val i, x.property⟩
map_add' := by
intro x y; ext i
change w i • (x.val i + y.val i) = w i • x.val i + w i • y.val i
exact smul_add _ _ _
map_smul' := by intro c x; ext i; simp [smul_smul, mul_comm] }
@[simp]
theorem diagonal_apply (w : ι → ℂ) (x : (diagonal (G := G) w).domain) (i : ι) :
diagonal w x i = w i • x.val i := rfl
theorem mem_graph_iff (w : ι → ℂ) (x y : Space G) :
(x,y) ∈ (diagonal w).graph ↔ ∀ i, y i = w i • x i := by
constructor
· intro hz i
obtain ⟨z,hz,hzw⟩ := (diagonal w).mem_graph_iff.mp hz
have h1 : (z : Space G) = x := hz
have h2 : diagonal w z = y := hzw
have hi := congrArg (fun v : Space G => v i) h2
change w i • (z : Space G) i = y i at hi
rw [h1] at hi
exact hi.symm
· intro h
have hd : x ∈ domain w := by
change Memℓp (fun i => w i • x i) 2
convert lp.memℓp y using 1
ext i; exact (h i).symm
exact (diagonal w).mem_graph_iff.mpr ⟨⟨x,hd⟩,rfl,by ext i; exact (h i).symm⟩
theorem diagonal_closed (w : ι → ℂ) : (diagonal (G := G) w).IsClosed := by
have heq : ((diagonal (G := G) w).graph : Set (Space G × Space G)) =
⋂ i, {z : Space G × Space G | z.2 i = w i • z.1 i} := by
ext z; simp only [Set.mem_iInter, Set.mem_ofPred_eq]
exact mem_graph_iff w z.1 z.2
rw [LinearPMap.IsClosed, heq]
apply isClosed_iInter
intro i
exact isClosed_eq ((lp.evalCLM ℂ G 2 i).continuous.comp continuous_snd)
(((lp.evalCLM ℂ G 2 i).continuous.comp continuous_fst).const_smul (w i))
variable [DecidableEq ι]
theorem single_mem_domain (w : ι → ℂ) (i : ι) (v : G i) :
lp.single 2 i v ∈ domain w := by
change Memℓp _ 2
have heq : (fun j => w j • lp.single 2 i v j) = (lp.single 2 i (w i • v) : ∀ j, G j) := by
ext j; by_cases h : j = i
· subst h; simp
· simp [lp.single_apply, h]
rw [heq]
exact lp.memℓp _
theorem diagonal_single (w : ι → ℂ) (i : ι) (v : G i) :
diagonal w ⟨lp.single 2 i v, single_mem_domain w i v⟩ = lp.single 2 i (w i • v) := by
ext j; by_cases h : j = i
· subst h; simp
· simp [lp.single_apply, h]
theorem domain_dense (w : ι → ℂ) : Dense (domain (G := G) w : Set (Space G)) := by
intro x
apply mem_closure_of_tendsto (lp.hasSum_single (by norm_num : (2 : ℝ≥0∞) ≠ ⊤) x)
apply Filter.Eventually.of_forall
intro s
exact Submodule.sum_mem _ (fun i _ => single_mem_domain w i (x i))
variable [∀ i, CompleteSpace (G i)]
omit [DecidableEq ι] [∀ i, CompleteSpace (G i)] in
theorem diagonal_formalAdjoint (w : ι → ℂ) :
(diagonal (G := G) w).IsFormalAdjoint (diagonal (fun i => star (w i))) := by
intro x y
rw [← (lp.hasSum_inner (diagonal w x) (y : Space G)).tsum_eq,
← (lp.hasSum_inner (x : Space G) (diagonal (fun i => star (w i)) y)).tsum_eq]
apply tsum_congr
intro i
simp only [diagonal_apply, inner_smul_left, inner_smul_right, starRingEnd_apply]
theorem adjoint_coordinate (w : ι → ℂ) (y : (diagonal (G := G) w).adjoint.domain)
(i : ι) : (diagonal (G := G) w).adjoint y i = star (w i) • (y : Space G) i := by
apply ext_inner_right ℂ
intro v
have h : inner ℂ ((diagonal (G := G) w).adjoint y) (lp.single 2 i v) =
inner ℂ (y : Space G) (lp.single 2 i (w i • v)) := by
have hh := (LinearPMap.adjoint_isFormalAdjoint (domain_dense (G := G) w)) y
⟨lp.single 2 i v, single_mem_domain (G := G) w i v⟩
rw [diagonal_single] at hh
exact hh
rw [lp.inner_single_right, lp.inner_single_right] at h
simpa only [inner_smul_right, inner_smul_left, star_star, starRingEnd_apply] using h
theorem adjoint_le_diagonal (w : ι → ℂ) :
(diagonal (G := G) w).adjoint ≤ diagonal (G := G) (fun i => star (w i)) := by
apply LinearPMap.le_graph_iff.mp
intro z hz
obtain ⟨y,hy,hTy⟩ := ((diagonal (G := G) w).adjoint).mem_graph_iff.mp hz
apply (mem_graph_iff (G := G) _ _ _).mpr
intro i
have h1 : (y : Space G) = z.1 := hy
have h2 : (diagonal (G := G) w).adjoint y = z.2 := hTy
have hi := adjoint_coordinate w y i
rw [h1, h2] at hi
exact hi
theorem adjoint_diagonal (w : ι → ℂ) :
(diagonal (G := G) w).adjoint = diagonal (fun i => star (w i)) := by
apply le_antisymm (adjoint_le_diagonal w)
have hf : (diagonal (G := G) w).IsFormalAdjoint (diagonal (fun i => star (w i))) :=
diagonal_formalAdjoint w
exact hf.le_adjoint (domain_dense w)
def finiteCore : Submodule ℂ (Space G) :=
Submodule.span ℂ {x | ∃ i v, x = lp.single 2 i v}
omit [∀ i, CompleteSpace (G i)] in
theorem single_mem_finiteCore (i : ι) (v : G i) :
lp.single 2 i v ∈ finiteCore (G := G) :=
Submodule.subset_span ⟨i,v,rfl⟩
omit [∀ i, CompleteSpace (G i)] in
theorem finiteCore_le_domain (w : ι → ℂ) : finiteCore (G := G) ≤ domain w := by
apply Submodule.span_le.mpr
rintro _ ⟨i,v,rfl⟩
exact single_mem_domain w i v
omit [∀ i, CompleteSpace (G i)] in
theorem diagonal_hasCore (w : ι → ℂ) :
(diagonal (G := G) w).HasCore finiteCore := by
let T := (diagonal (G := G) w).domRestrict finiteCore
have hT : T.IsClosable := (diagonal_closed w).isClosable.leIsClosable
LinearPMap.domRestrict_le
refine ⟨finiteCore_le_domain w, ?_⟩
apply LinearPMap.eq_of_eq_graph
rw [← hT.graph_closure_eq_closure_graph]
apply le_antisymm
· exact Submodule.topologicalClosure_minimal _
(LinearPMap.le_graph_of_le LinearPMap.domRestrict_le) (diagonal_closed w)
· intro z hz
have hzy := (mem_graph_iff w z.1 z.2).mp hz
have hs := (lp.hasSum_single (by norm_num : (2 : ℝ≥0∞) ≠ ⊤) z.1).prodMk
(lp.hasSum_single (by norm_num : (2 : ℝ≥0∞) ≠ ⊤) z.2)
apply mem_closure_of_tendsto hs
apply Filter.Eventually.of_forall
intro s
apply Submodule.sum_mem
intro i _
apply T.mem_graph_iff.mpr
have hdom : lp.single 2 i (z.1 i) ∈ T.domain :=
⟨single_mem_finiteCore _ _, single_mem_domain _ _ _⟩
refine ⟨⟨_,hdom⟩,rfl,?_⟩
change diagonal w ⟨lp.single 2 i (z.1 i),single_mem_domain _ _ _⟩ = _
rw [diagonal_single, ← hzy i]
theorem real_diagonal_selfAdjoint (w : ι → ℝ) :
(diagonal (G := G) (fun i => (w i : ℂ))).adjoint = diagonal (fun i => (w i : ℂ)) := by
rw [adjoint_diagonal]
simp only [Complex.star_def, Complex.conj_ofReal]
end HilbertScale
namespace OperatorTransport
variable {H : Type u} {K : Type v}
[NormedAddCommGroup H] [InnerProductSpace ℂ H]
[NormedAddCommGroup K] [InnerProductSpace ℂ K]
def transport (E : H ≃ₗᵢ[ℂ] K) (T : K →ₗ.[ℂ] K) : H →ₗ.[ℂ] H where
domain := T.domain.comap E.toLinearEquiv.toLinearMap
toFun :=
{ toFun := fun x => E.symm (T ⟨E x.val, x.property⟩)
map_add' := by
intro x y
simp only [Submodule.coe_add,map_add]
change E.symm (T (⟨E x.val,x.property⟩ + ⟨E y.val,y.property⟩)) = _
rw [T.map_add,map_add]
map_smul' := by
intro c x
simp only [Submodule.coe_smul,map_smul]
change E.symm (T (c • (⟨E x.val,x.property⟩ : T.domain))) = _
rw [T.map_smul,map_smul]
rfl }
theorem mem_graph_iff (E : H ≃ₗᵢ[ℂ] K) (T : K →ₗ.[ℂ] K) (x y : H) :
(x,y) ∈ (transport E T).graph ↔ (E x, E y) ∈ T.graph := by
rw [(transport E T).mem_graph_iff, T.mem_graph_iff]
constructor
· rintro ⟨z,hz,hzy⟩
dsimp only [Prod.fst,Prod.snd] at hz hzy ⊢
have hmem : E z.val ∈ T.domain := z.property
refine ⟨⟨E z.val,hmem⟩,congrArg E hz,?_⟩
rw [← hzy]
exact (E.apply_symm_apply _).symm
· rintro ⟨z,hz,hzy⟩
dsimp only [Prod.fst,Prod.snd] at hz hzy ⊢
have hx : x ∈ (transport E T).domain := by
change E x ∈ T.domain
rw [← hz]; exact z.property
refine ⟨⟨x,hx⟩,rfl,?_⟩
change E.symm (T ⟨E x,hx⟩) = y
have hz' : (⟨E x,hx⟩ : T.domain) = z := Subtype.ext hz.symm
rw [hz',hzy,E.symm_apply_apply]
end OperatorTransport
end StronglyRationalVOA
end
end OAI