a是正对定矩阵可得出a的转置是a,对吗
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绛旓細浠ヤ笅鐢ˋ*琛ㄧずA鐨鍏辫江杞疆A*Ax=A*Ay=>A*A(x-y)=0=>(x-y)*A*A(x-y)=0=>[A(x-y)]*A(x-y)=0=>A(x-y)=0=>Ax=Ay
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