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

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