Re: [理工] [線代]
看見d大的推文,讓我想到一個方法
2
A=I-2uu^T , Au= u-2u(u^T * u) = u-2u = -u , A u = A(-u) = u
2 -1
根據 A = I 且 A = -I => A = A = -I
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