`BookProof.FriedrichsSquare.le_factorRel_of_symmetric_extension` {A : D →ₗ[ℂ] F} (hsym : SymmetricOn D A) {hstab : ∀ v : D, (A v : F) ∈ D} {R : Submodule ℂ (F × F)} (hext : ∀ v : D

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`BookProof.FriedrichsSquare.le_factorRel_of_symmetric_extension` {A : D →ₗ[ℂ] F} (hsym : SymmetricOn D A) {hstab : ∀ v : D, (A v : F) ∈ D} {R : Submodule ℂ (F × F)} (hext : ∀ v : D · Prove2Me