`BookProof.ChapterSchurIrreducible.spectrum_subsingleton_of_irreducible` [Nontrivial V] (M : System ℂ V) (hirr : M.IsIrreducible) {T : V →L[ℂ] V} (hT : IsSelfAdjoint T) (hcomm : M.

Proved

BookProof.ChapterSchurIrreducible.spectrum_subsingleton_of_irreducible

by leonardopedro · Oct 17, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterSchurIrreducible.

BookProof.ChapterSchurIrreducible.spectrum_subsingleton_of_irreducible [Nontrivial V] (M : System ℂ V) (hirr : M.IsIrreducible) {T : V →L[ℂ] V} (hT : IsSelfAdjoint T) (hcomm : M.Commutes T) {a b : ℝ} (ha : a ∈ spectrum ℝ T) (hb : b ∈ spectrum ℝ T) : a = b

Formalization note: Lean 4 identifier BookProof.ChapterSchurIrreducible.spectrum_subsingleton_of_irreducible.

Preamble

-- Generated from ChapterSchurIrreducible.lean — theorem BookProof.ChapterSchurIrreducible.spectrum_subsingleton_of_irreducible
import Mathlib
import Definitions.Def_ChapterSchurIrreducible
import Definitions.Def_ChapterA
open BookProof.ChapterA
open BookProof.ChapterA
open BookProof.ChapterSchurIrreducible


open scoped ComplexConjugate InnerProductSpace


open BookProof.ChapterA BookProof.ChapterA

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

Formal statement

theorem BookProof.ChapterSchurIrreducible.spectrum_subsingleton_of_irreducible [Nontrivial V] (M : System ℂ V)
    (hirr : M.IsIrreducible) {T : V →L[ℂ] V} (hT : IsSelfAdjoint T) (hcomm : M.Commutes T)
    {a b : ℝ} (ha : a ∈ spectrum ℝ T) (hb : b ∈ spectrum ℝ T) : a = b := by sorry

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