`BookProof.ChapterPauliFundamental.sel_hi_mem` : ∀ (μ : Fin 4) (T : Finset (Fin 4)), μ ∈ T → sel (hi μ T) = μ

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`BookProof.ChapterPauliFundamental.sel_hi_mem` : ∀ (μ : Fin 4) (T : Finset (Fin 4)), μ ∈ T → sel (hi μ T) = μ :: sel (hi μ (T.erase μ)) · Prove2Me