Hey.. I ran across some problems and the notation used is a little different from what I've seen before.(adsbygoogle = window.adsbygoogle || []).push({});

considering U(x,y)=X(x)Y(y)

Sometimes I'll see U_{xx}for [tex]\frac{d^{2}u}{dt^{2}}[/tex] which equals X''Y

Or U_{x}for [tex]\frac{du}{dt}[/tex] which equals X'Y

But what about U'_{x}

Is that a redundant way of saying the partial derivative of U with respect to x?

Or is it saying the derivativeofthe partial derivative of U with respect to x?

As I originally read it, I considered it X'Y, but now I'm wondering if maybe its X"Y.

Thanks!

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# Notation for separable partial differential equations

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