`BookProof.ChapterG.ghost_creat_sq` : ghostCreat * ghostCreat = (0 : Matrix (Fin 2) (Fin 2) A)

Initializing...

`BookProof.ChapterG.ghost_creat_sq` : ghostCreat * ghostCreat = (0 : Matrix (Fin 2) (Fin 2) A) · Prove2Me