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## Main Question or Discussion Point

I know writing [tex]\frac{\partial^{1}u}{\partial x^{1}}[/tex] is "bad" notation, but can I still write the sum:

[tex]\sum^{n}_{k=1}\frac{\partial^{k}u}{\partial x^{k}}[/tex]

??

THANK YOU

PS. Being able to write LaTeX equations is actually awesome.

[tex]\sum^{n}_{k=1}\frac{\partial^{k}u}{\partial x^{k}}[/tex]

??

THANK YOU

PS. Being able to write LaTeX equations is actually awesome.