A general orthogonal coordinate system (u,v,w) will have a line elemet of the form:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] ds^2 = f^2 du^2 + g^2dv^2 + h^2dw^2[/tex]

I have done a lot of vector calculus, but for some reason I can't figure out what this means! What is a line element? I know about the differential length element and its a vector, but this is a scalar! Also, what's up with all the squares?

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# Line element

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