[線代] symmetric, nonsingular
let A and B be n*n symmetric matrices and let C=AB. Is C symmetric?
let E and F be n*n elementary matrices and let C=EF. Is C nonsingular?
這兩題我直覺都是true
因為我看過這樣的題目
可是應該怎麼解釋呢?
謝謝
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