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[几何] 3维向量的反交换的夹角

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hbghlyj Post time 2023-9-6 15:40 |Read mode
本帖最后由 hbghlyj 于 2023-9-6 16:14 编辑 对$v_1,v_2\inR^2$可以定义函数$f(v_1,v_2)\inR/2\pi\mathbb Z$满足:
  • $v_1\cdot v_2=|v_1||v_2|\cos f(v_1,v_2)$
  • $f(v_1,v_2)=-f(v_2,v_1)$
  • $f$关于$v_1$、$v_2$连续

问题:对$v_1,v_2\inR^3$是否可以定义函数$f(v_1,v_2)\inR/2\pi\mathbb Z$满足以上条件?

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 Author| hbghlyj Post time 2023-9-6 16:17
$v_1,v_2\inR^2$可以定义$f(v_1,v_2)$为$v_1,v_2$的辐角之差mod 2π
但在3维无法定义幅角,猜测不存在满足条件的$f$

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