设A为正交矩阵,证明:|A|=1或|A|=-1.
证明:因为A为正交矩阵,所以ATA=E, 将上式两边取行列式,有 |ATA|=|E|, |AT|•|A|=1, |A|2=1, 故|A|=1或|A|=-1.
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