I am still very confused about the differences between all the d's and delta's used to represent infinitesimal elements and/or derivatives and never know when and where to use what:(adsbygoogle = window.adsbygoogle || []).push({});

- [tex]du[/tex]

- [tex]\partial u[/tex]

- [tex]\delta u[/tex]

For instance what can be simplified exactly in the chain rule and also what to use in an integral.

Thanks for your help!

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# Delta, derivative, differential etc.

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