Dot Product Associates with Scalar Multiplication/Proof 3
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Theorem
- $\paren {c \mathbf u} \cdot \mathbf v = c \paren {\mathbf u \cdot \mathbf v}$
Proof
From Dot Product Operator is Bilinear:
- $\left({c \mathbf u + \mathbf v}\right) \cdot \mathbf w = c \left({\mathbf u \cdot \mathbf w}\right) + \left({\mathbf v \cdot \mathbf w}\right)$
Setting $\mathbf v = 0$ and renaming $\mathbf w$ yields the result.
$\blacksquare$