Hi Ondrej,

I understand your concerns on the dangers of having two similar
projects.  However, I think it would be impossible for me to
develop the core within the restrictions of the sympy
policy for several reasons that I'll discuss below.

The issues that are considered difficult to resolve in the
current sympy (such as speed, assumptions model, caching issues)
become almost unresolvable within the current sympy development
policy (which btw is very good for a mature project).

Nobody knows what is the best way to resolve these issues,
therefore one must experiment and that may temporarily break lots of
code.
This is not reasonable with the current state of sympy. This situation
of
changing-the-core-without-breakage will never get
better and so solving the hard issues within sympy policy is quite
impossible.

I agree that discussing changes is a good thing. We have
discussed quite alot what are the fundamental issues in sympy
and proposed possible ways of resolving these.
As a rule, fixing fundamental issues require fundamental changes.
I think it is time to start implementing them and sympycore
is a proper place to do it.

I have spent lots of effort on sympycore by now (in fact
more than I planned initially) and I can say that I see light:)
At the moment it is too early to discuss about merging
sympycore to sympy but when the time is ready, I think
the merge will not be as painful as the first one.

Regards,
Pearu


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