[Nontrivial F] (T : F →L[ℂ] F) (hT : IsSelfAdjoint T) : (spectrum ℝ T).Nonempty

-- Generated from ChapterSirkRitzSpectrum.lean — theorem BookProof.ChapterSirkRitzSpectrum.spectrum_real_nonempty
import Mathlib
import Definitions.Def_ChapterSirkRitzSpectrum
open BookProof.ChapterSirkRitzSpectrum







noncomputable section


open Filter Topology RCLike ContinuousLinearMap ComplexOrder Pointwise

variable {F : Type*} [NormedAddCommGroup F] [InnerProductSpace ℂ F] [CompleteSpace F]

theorem BookProof.ChapterSirkRitzSpectrum.spectrum_real_nonempty [Nontrivial F] (T : F →L[ℂ] F) (hT : IsSelfAdjoint T) :
    (spectrum ℝ T).Nonempty := by sorry