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只要證明方程組A'Ax=0和Ax=0同解(記A'=At) 若x是Ax=0的解,則顯然x也是A'Ax=0的解 若x是A'Ax=0的解 則x'A'Ax=x'0=0 (Ax)'(Ax)=0 ||Ax||=0 Ax的範數為0的當且僅當Ax=0 所以x是Ax=0的解.
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