`BookProof.ChapterGleasonPureMixed.exists_pure_expP0` : ∃ ρ : Matrix (Fin 2) (Fin 2) ℝ, IsPureState ρ ∧ E ρ P0 = 1/2

Initializing...

`BookProof.ChapterGleasonPureMixed.exists_pure_expP0` : ∃ ρ : Matrix (Fin 2) (Fin 2) ℝ, IsPureState ρ ∧ E ρ P0 = 1/2 · Prove2Me