On Aug 25, 2008, at 8:35 AM, Gary Furnish wrote:

> I've been trying to get an answer for this question for the last few
> weeks: Is the plan to extend ginac (write algorithms in C) or to
> extend sage (write new algorithms in Sage) using cython/python?

I don't think this was addressed in the email, but my understanding  
is that the plan is very much the latter. Perhaps (I hope) that much  
of this will not be re-implementation so much as porting SymPy  
algorithms/getting SymPy to run on top of GiNaC.

> This is very much a design related question, and in the hurry to  
> get GiNaC
> through review I feel that design issues and questions have been very
> much ignored.  To put the question somewhat differently, are
> algorithms using the new symbolics system going to be use GiNaC/pynac
> enough that switching to any other low level system will be very, very
> difficult (because new code such as sums may depend directly on GiNaC
> specific behavior)?  If this is not intended, what will be done to try
> to prevent Sage from becoming overly dependent on GiNaC in the long
> term?
>
> --Bill

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