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关于1.3 |P+Q|≤|P|+|Q|的证明 #1

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jokerlee opened this issue Nov 17, 2014 · 0 comments

jokerlee commented Nov 17, 2014

|P+Q|≤|P|+|Q|的证明中涉及了向量的点积的定义，但是点积在1.4才介绍，建议加一行注或者把证明挪到1.4中

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