[線代] 矩陣性質兩題
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1. Show that A A is positive semidefinite when the columns of A are
linearly dependent and is positive definite when the columns are
linearly independent.
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2. From A = R R, show for positive definite matrices that
det(A) <= a11a22...ann
麻煩高手提點一下了，謝謝！
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