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這是從物理實踐中來,在物理計算中,經常會用到一個向量投影到另一個向量的方向,然後再乘以另一個向量的模.而且這樣的算灋表示固定的物理意義.由於經常會遇到這種問題,於是有人就這樣定義了內積,是為了便於書寫和直觀…
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