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Project-declaredLean 4.32.0 Β· mathlib@249c48c2

Tensor Product localcomponent apply

IsDedekindDomain.FiniteAdeleRing.TensorProduct.localcomponent_apply

Plain-language statement

If Ο† : 𝔸_K^f βŠ— V β†’ 𝔸_K^f βŠ— V is 𝔸_K^f-linear and Ο†β‚š is its local component at a place p then for all x : 𝔸_K^f βŠ— V we have (evalβ‚š βŠ— id_V) (Ο† x) = Ο†β‚š ((evalβ‚š βŠ— id_V) x), or, more colloquiually, (Ο† x)β‚š = Ο†β‚š (xβ‚š).

Exact Lean statement

lemma TensorProduct.localcomponent_apply
    (Ο† : FiniteAdeleRing R K βŠ—[K] V β†’L[FiniteAdeleRing R K] FiniteAdeleRing R K βŠ—[K] V)
    (x : FiniteAdeleRing R K βŠ—[K] V) (p : HeightOneSpectrum R) :
    (ContinuousLinearMap.rTensor' V
      (evalContinuousAlgebraMap R K p).toContinuousLinearMap) (Ο† x) =
    TensorProduct.localcomponent R K V p Ο† ((ContinuousLinearMap.rTensor' V
      (evalContinuousAlgebraMap R K p).toContinuousLinearMap) x)

Formal artifact

Lean source

Canonical source
Full Lean sourceLean 4
lemma TensorProduct.localcomponent_apply    (Ο† : FiniteAdeleRing R K βŠ—[K] V β†’L[FiniteAdeleRing R K] FiniteAdeleRing R K βŠ—[K] V)    (x : FiniteAdeleRing R K βŠ—[K] V) (p : HeightOneSpectrum R) :    (ContinuousLinearMap.rTensor' V      (evalContinuousAlgebraMap R K p).toContinuousLinearMap) (Ο† x) =    TensorProduct.localcomponent R K V p Ο† ((ContinuousLinearMap.rTensor' V      (evalContinuousAlgebraMap R K p).toContinuousLinearMap) x) := by  dsimp [localcomponent]  rw [← ContinuousLinearMap.rTensor'_comp_apply]  change (LinearMap.rTensor V _) (Ο† x) = (LinearMap.rTensor V _) (Ο† ((LinearMap.rTensor V _) x))  rw [singleContinuousAlgebraMap_comp_evalContinuousLinearMap]  let f := (LinearMap.lsmul    (FiniteAdeleRing R K) (FiniteAdeleRing R K) (localIdempotent R K p)).restrictScalars K  have hf : LinearMap.rTensor V f x = (localIdempotent R K p) β€’ x := by    induction x with    | zero => simp    | tmul x y => exact LinearMap.rTensor_tmul _ _ _ _    | add x y _ _ => simp_all  rw [hf, ContinuousLinearMap.map_smul]  change (AlgHom.rTensor V ((evalContinuousAlgebraMap R K p).toAlgHom)) (Ο† x) =    (AlgHom.rTensor V ((evalContinuousAlgebraMap R K p).toAlgHom)) (localIdempotent R K p β€’ Ο† x)  simp [eval_localIdempotent]
Project
Fermat's Last Theorem
License
Apache-2.0
Commit
8dd808888295
Source
FLT/DedekindDomain/FiniteAdeleRing/TensorProduct.lean:116-137

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