https://github.com/sympy/sympy/pull/18174 is open for the ability to work
with equations and https://github.com/sympy/sympy/issues/19191 for
extracting constants/sign from Integral/Sum.
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I think #19191 addresses removal of constant/sign from Sum/Integral. And
#18174 addresses the ability to work with equations.
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Do you want me to open issues on GitHub? This is actually two topic
(equations and sums), an I should have known better than to combine them.
>
>
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Seeing that use of factor_terms makes me think again that expand
should definitely pull out that constant.
On Thu, 30 Apr 2020 at 22:27, Chris Smith wrote:
>
> The following light-weight version of what Oscar has suggested might be
> sufficient:
>
> >>> def add(s,o):
> ... assert s.func ==
The following light-weight version of what Oscar has suggested might be
sufficient:
>>> def add(s,o):
... assert s.func == o.func
... return s.func(s.lhs+o.lhs,o.rhs+s.rhs)
...
>>> def mul(s,o):
... return s.func(o*s.lhs,o*s.rhs)
...
>>> def rmul(s,o):
... return s.func(o*s.lhs,o*s.rhs)
