推 ZanFu5566:我也覺得是c == 10/28 12:42
推 ILzi:請見下篇 10/28 21:24
(1) Consider ann*n symmetric matrix A. If A is positive definite,
then which of the following four properties is wrong?
a. Aii>0
b. A is invertible
c. Aii+Ajj-2Aij>0
d. AiiAjj-Aij^2>0
e. All are correct.
答案給B,正定一定可逆吧?我覺得答案是C...
感謝
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