vault backup: 2026-05-28 00:20:53

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ben committed 2026-05-28 00:20:53 -07:00
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@@ -22,6 +22,8 @@ Used to find the vector of magnitude 1 in the same direction as $u$
$$a \times b = \begin{vmatrix} i&j&k\\a_1&a_2&a_3\\b_1&b_2&b_3\end{vmatrix}= i(a_2b_3-a_3b_2)-j(a_1b_3-a_3b_1)+k(a_1b_2-a_2b_1)$$
Used to create a vector that is orthogonal to both $a$ and $b$. To find what direction it will point in use the right-hand rule (thumb, pointer and middle finger).
The cross product is calculated by finding the [[Determinant of a Matrix|determinant]] of the matrix formed in the equation above with the unit vectors in the top row.
Properties:
- Not commutative $$u\times v \ne v \times u$$
- Anti-commutative $$ u \times v = -(v \times u) $$