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["Garth N. Wells" <gnw20@xxxxxxxxx>]

Martin Sandve Alnæs wrote:
> Is there a mathematical difference?

Splitting hairs, I would say yes and that grad(u('+')) is correct and 
grad(u)('+') is not because grad(u) is not defined in a classical sense. 
I prefer grad(u('+')), but FFC used to use grad(u)('+'). My preference 
is however not strong.

My immediate question is will the generated code differ for grad(u('+')) 
and grad(u)('+')?

Garth




> Martin
>
>
>
> On Thu, May 14, 2009 at 8:15 AM, Garth N. Wells <gnw20@xxxxxxxxx> wrote:
> > Is the correct syntax for the restriction of the gradient (or any other
> > operator) of a function to one side a facet
> >
> >     grad(u)('+')
> >
> > or
> >
> >     grad(u('+'))
> >
> > ?
> >
> > Garth
> >
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