`BookProof.ChapterGaugeUnconstrainedSpectrum.isPhysicalFunction_iff_factors` (ρ : G →* Equiv.Perm X) (d : X → ℂ) : IsPhysicalFunction ρ d ↔ ∃ D : observableSpectrum ρ → ℂ, ∀ x : X,

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`BookProof.ChapterGaugeUnconstrainedSpectrum.isPhysicalFunction_iff_factors` (ρ : G →* Equiv.Perm X) (d : X → ℂ) : IsPhysicalFunction ρ d ↔ ∃ D : observableSpectrum ρ → ℂ, ∀ x : X, · Prove2Me