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設三階方陣A的三重特徵根為c 首先看這唯一的特徵值c是不是0 1如果c是0那麼Ax=cx=0那麼由於矩陣只有2個線性無關的特徵向量,即解空間的維數等於2那麼rkA=n-dim解空間=3-2=1 2如果c非0那麼A的行列式值為c的3次方就是說A是非奇异的所以滿秩為3
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