`BookProof.FriedrichsSquare.opGraph_frExt` (A : D →ₗ[ℂ] F) (hdense : Dense (D : Set F)) (hsym : SymmetricOn D A) : opGraph (frExt A hdense hsym) = factorRel A

Proved

BookProof.FriedrichsSquare.opGraph_frExt

by leonardopedro · Oct 17, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterFriedrichsSquareFactorization.

BookProof.FriedrichsSquare.opGraph_frExt (A : D →ₗ[ℂ] F) (hdense : Dense (D : Set F)) (hsym : SymmetricOn D A) : opGraph (frExt A hdense hsym) = factorRel A

Formalization note: Lean 4 identifier BookProof.FriedrichsSquare.opGraph_frExt.

Preamble

-- Generated from ChapterFriedrichsSquareFactorization.lean — theorem BookProof.FriedrichsSquare.opGraph_frExt
import Definitions.Def_ChapterFarisLavine
import Mathlib
import Definitions.Def_ChapterFriedrichsSquareFactorization
import Definitions.Def_ChapterClosureUniqueness
import Definitions.Def_ChapterEsaClosureCore
import Definitions.Def_ChapterFarisLavineCore
open BookProof.ClosureUniqueness
open BookProof.EsaClosure
open BookProof.FriedrichsSquare



open BookProof.FarisLavine BookProof.EsaClosure BookProof.ClosureUniqueness

variable {F : Type*} [NormedAddCommGroup F] [InnerProductSpace ℂ F]
variable {D : Submodule ℂ F}

variable [CompleteSpace F]

Formal statement

theorem BookProof.FriedrichsSquare.opGraph_frExt (A : D →ₗ[ℂ] F) (hdense : Dense (D : Set F)) (hsym : SymmetricOn D A) :
    opGraph (frExt A hdense hsym) = factorRel A := by sorry

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