Suppose we are taking the variation of a multiple integral and the integrand contains some terms with [itex]\frac{\partial g}{\partial x}[/itex]. When is it ok to put(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\delta\frac{\partial g}{\partial x}=\frac{\partial}{\partial x}(\delta g)[/itex]

?

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# Variation of a derivative?

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