OK, thanks for all the suggestions. I think for now in the interest of time 
I plan to look at what Sean had suggested. Will post back an update on this 
sometime soon.

-Guru


On Saturday, August 18, 2012 9:50:01 PM UTC-5, Aaron Meurer wrote:
>
> I created http://code.google.com/p/sympy/issues/detail?id=3366 for the 
> DummyFunction.  I guess what you want perhaps is doable, but even the 
> physics or diff geom stuff will either be hacks, or limited.  We 
> really should have support for arbitrary operators on functions in the 
> core of SymPy. 
>
> Also, users shouldn't have to know physics or differential geometry to use 
> it. 
>
> On Sat, Aug 18, 2012 at 5:21 PM, [email protected] <javascript:> 
> <[email protected] <javascript:>> wrote: 
> > However the commutator in the diffgeom module is between differential 
> > operators. It is not exactly what you ask for. Actually I do not 
> > understand how "x" acts on anything in your example as it is not a 
> > differential operator (it can be regarded as a hermitian operator as 
> > in quantum mechanics "acting" simply by multiplication, however this 
> > requires to much magic for the moment) 
>
> IMHO, this should be represented as x*Id, even with core operator 
> support. Ambiguous notation is nice for hand written stuff, but it's 
> better to use completely unambiguous notation when using a computer 
> algebra system. 
>
> Aaron Meurer 
>

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