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幂等矩陣(idempotent matrix)若A為方陣,且A^2=A,則A稱為幂等矩陣. 幂等矩陣的主要性質: 1.其特徵值只可能是0,1. 2.可對角化. 3.其伴隨矩陣和轉置矩陣仍為幂等矩陣. 4.其K次幂也是幂等矩陣. 5.其迹等於其秩. 6.同階可交換的幂等矩陣的和是幂等矩陣. 7.可逆的幂等矩陣為單位矩陣.
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