`BookProof.ChapterPauliFundamental.sel_lo_length` : ∀ (μ : Fin 4) (T : Finset (Fin 4)), (sel (lo μ T)).length = (lo μ T).card

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`BookProof.ChapterPauliFundamental.sel_lo_length` : ∀ (μ : Fin 4) (T : Finset (Fin 4)), (sel (lo μ T)).length = (lo μ T).card · Prove2Me