Hi! Can someone give me an example of a function ##f(x,y)## for which the mixed partial differentials are not equal, i.e. $$\frac{\partial^2 f}{\partial x \partial y} \neq \frac{\partial^2f}{\partial y \partial x}$$(adsbygoogle = window.adsbygoogle || []).push({});

It says in Boas that these mixed differentials are equal only if the first and second order partial differentials of ##x## and ##y## are continuous. I couldn't come up with any. Thanks

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# I Mixed partial differentials

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