### Image: Cycle of unit vectors

Cycle of unit vectors useful for remembering their cross products. When following the arrows, the cross product is positive: \begin{align*} \vc{i} \times \vc{j} &= \vc{k}\\ \vc{j} \times \vc{k} &=\vc{i}\\ \vc{k} \times \vc{i} &= \vc{j}. \end{align*} When going backward along the arrows, the cross product is negative: \begin{align*} \vc{j} \times \vc{i} &= -\vc{k}\\ \vc{k} \times \vc{j} &= -\vc{i}\\ \vc{i} \times \vc{k} &= -\vc{j}. \end{align*}Image file: unit_vectors_cycle.png

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