Quick (dumb) Notation Question

  • Thread starter AOA
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  • #1
AOA
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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.
 

Answers and Replies

  • #2
CompuChip
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When you write it explicitly it looks a bit weird, but I see no objection to using it in such a sum.
 
  • #3
AOA
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OK. I just wanted to make sure. Thanks!
 
  • #4
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Can I ask what kind of situation you're getting that sum in?
 
  • #5
arildno
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While uncommon, I don't see anything bad about it.

When dealing with just the first derivative of some function, it is superfluous, but completely analogical to the case that [itex]x=x^{1}[/itex]
Neither of these two notations are "bad" in any way.
 
  • #6
HallsofIvy
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I would even accept
[tex]\sum_{k=0}^n \frac{\partial^k u}{\partial x^k}[/tex]
with the understanding that
[tex]\frac{\partial^0 u}{\partial x^0}= u(x)[/tex]
 

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