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:<math>dA_\mathbf{y} = \begin{bmatrix} 1 & 0 & d\phi \\ 0 & 1 & 0 \\ -d\phi & 0 & 1 \end{bmatrix}.</math>
Compare the products {{math|''dA''<sub>'''x'''</sub> ''dA''<sub>'''y'''</sub>}} to {{math|''dA''<sub>'''y'''</sub> ''dA''<sub>'''x'''</sub>}},
:<math>\begin{align}
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