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[<kirby@xxxxxxxxxxxx>]

>
>I think there should be only one.
>
I agree.  Anything else is asking for confusion.

>I also like .dx() (obviously since I chose it), but maybe 
it's just
>because I'm used to it.
>
>Maybe
>
>    a = u.Dx(i)*v.Dx(i)*dx
>
>looks pretty nice?
>
This is the smallest transition away from overloading "dx".  
Perhaps it's the right thing to do.

Rob