11. 向量的外积运算
【注】也可以这么计算
11.1 向量的多重乘积
【命题】任意三个向量,
α
,
β
,
γ
\pmb{\alpha},\pmb{\beta},\pmb{\gamma}
α,β,γ,
(
α
×
β
)
×
γ
=
(
α
⋅
γ
)
β
−
(
β
⋅
γ
)
α
(\pmb{\alpha}\times\pmb{\beta})\times\pmb{\gamma}=(\pmb{\alpha}\cdot\pmb{\gamma})\pmb{\beta}-(\pmb{\beta}\cdot\pmb{\gamma})\pmb{\alpha}
(α×β)×γ=(α⋅γ)β−(β⋅γ)α