`BookProof.TempleSeparationNecessary.bddBelow_spectrum` (A : E2 →L[ℂ] E2) : BddBelow (spectrum ℝ A)

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`BookProof.TempleSeparationNecessary.bddBelow_spectrum` (A : E2 →L[ℂ] E2) : BddBelow (spectrum ℝ A) · Prove2Me