`BookProof.ChapterG.ghost_car` : ghostAnnih * ghostCreat + ghostCreat * ghostAnnih = (1 : Matrix (Fin 2) (Fin 2) A)

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`BookProof.ChapterG.ghost_car` : ghostAnnih * ghostCreat + ghostCreat * ghostAnnih = (1 : Matrix (Fin 2) (Fin 2) A) · Prove2Me