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![]() ¨§áÊ´§ÇèÒ¶éÒ A>0 áÅéÇ àÁ·ÃÔ¡«ì A^1/2 * A^1/2 = A ͸ԺÒÂÇÔ¸Õ¡ÒÃËÒ A^1/2 áÅÐáÊ´§ÇèÒ A^1/2 à»ç¹ symmetic HINT. ãªé eigenvalue decomposition ¢Í§ symmetric metric
A>0 ã¹·Õè¹ÕéËÁÒ¶֧ -all eigenvalues of A are non-negative -all principle minors of A are non-negative ¢ÍÍÀѶéÒÂѧãªé¤ÓÊÑè§äÁèà»ç¹ |
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