有一題
show that all elementary matrices are invertible
怎麼證？用說明的嗎？？@@~
in what situation you will compute a least-square solution through
a QR fractorization？
in what condition you can coumpute a least-square soution through
a QR fractorization？
這兩題can和will？？
謝謝!!!
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這不是trivial 嗎？怎麼證XD
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