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`BookProof.TempleSeparationNecessary.separation_necessary` (M : ℝ) : ∃ (A : E2 →L[ℂ] E2) (x : E2), IsSelfAdjoint A ∧ ‖x‖ = 1 ∧ rayleigh A x = 0 ∧ resid A x = 0 ∧ sInf... · Prove2Me