Small fix
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@ -231,7 +231,7 @@ The \key{cross product} $a \times b$ of vectors
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$a=(x_1,y_1)$ and $b=(x_2,y_2)$ equals $x_1 y_2 - x_2 y_1$.
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The cross product tells us whether $b$
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turns left (positive value), does not turn (zero)
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or turns to right (negative value)
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or turns right (negative value)
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when it is placed directly after $a$.
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The following picture illustrates the above cases:
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