`BookProof.FriedrichsSquare.IsFriedrichsSqExtension.symmetric` {A : D →ₗ[ℂ] F} {hstab : ∀ v : D, (A v : F) ∈ D} {R : Submodule ℂ (F × F)} (h : IsFriedrichsSqExtension A hstab R) :

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`BookProof.FriedrichsSquare.IsFriedrichsSqExtension.symmetric` {A : D →ₗ[ℂ] F} {hstab : ∀ v : D, (A v : F) ∈ D} {R : Submodule ℂ (F × F)} (h : IsFriedrichsSqExtension A hstab R) : · Prove2Me