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公式2.58 #pdf 43页 #出版物30页 #208

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bizheyandebing opened this issue Jan 12, 2020 · 1 comment

bizheyandebing commented Jan 12, 2020

x ⊤ x − x ⊤ g(c) − g(c) ⊤ x + g(c) ⊤ g(c) (2.57)
(分配律)
= x ⊤ x − 2x ⊤ g(c) + g(c) ⊤ g(c) (2.58)
从2.57 推到2.58应当是交换律吧怎么会是分配率呢？
不应该是根据交换律得到 x ⊤ g(c) = g(c) ⊤ x 才有了2x ⊤ g(c)

Author

bizheyandebing commented Jan 12, 2020

哦我似乎明白了他是将没项前面的单位1提出来做分配
omg 我的脑回路和作者差太远了

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