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Notation issue: Grad with a vector subscript 
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#1
Apr1109, 07:23 AM

P: 40

I'm reading a journal article at the moment which uses a piece of notation which they dont actually define. It looks like this:
[tex]\nabla_{\vec Q}[/tex] (As it happens, [tex]\vec Q[/tex] is an ordinary vector indicating the orientation of a polymer.) I've never seen vector subscript on the gradient symbol "[tex]\nabla[/tex]" before. Could anyone please tell me what [tex]\nabla[/tex] with a vector subscript usually means? 


#2
Apr1109, 07:31 AM

Math
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Thanks
PF Gold
P: 39,552

First, since you mention polymers, I am inclined to think the symbol has more to do with chemistry than mathematics. If it really is purely mathematics then I would be inclined to think "the derivative in the direction of [itex]\vec{Q}[/itex]".



#3
Apr1209, 05:39 AM

P: 40

Thanks, the derivative in the direction of the vector makes sense in context.



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