(T : F →L[ℂ] F) (k : ℕ) (hne : (minmaxSet T k).Nonempty) : minmaxLevel T k ≤ ‖T‖

-- Generated from ChapterSirkRitzPerturbation.lean — theorem BookProof.RitzPerturbation.minmaxLevel_le_norm
import Mathlib
import Definitions.Def_ChapterSirkRitzPerturbation
open BookProof.RitzPerturbation








noncomputable section


open BookProof.RitzMinMax BookProof.ChapterSirkRitzSpectrum BookProof.HermiteGalerkin
open Filter Topology

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

theorem BookProof.RitzPerturbation.minmaxLevel_le_norm (T : F →L[ℂ] F) (k : ℕ) (hne : (minmaxSet T k).Nonempty) :
    minmaxLevel T k ≤ ‖T‖ := by sorry