如果A是实对称矩阵,且A^2=0,证明:A=0
用矩阵的运算进行证明哦.
人气:127 ℃ 时间:2019-12-19 06:09:56
解答
用基本的矩阵知识就行.使用矩阵乘积的定义.设A是n阶方阵,第i行j列元素是aij. A的转置记为A^T,则0=A^2=A×A^T所以A×A^T的主对角线元素(a11)^2+(a12)^2+.+(a1n)^2=0(a21)^2+(a22)^2+.+(a2n)^2=0.(an1)^2+(...
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