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Comment #1 on issue 1592 by asmeurer: Pretty print Sum with a Sigma
http://code.google.com/p/sympy/issues/detail?id=1592
We should also improve the pretty printing of RootSum to print a Sigma.
Maple does something like this:
> sum(f(x), x=RootOf(x**5 + x + 1));
-----
\
)
/ f(x)
-----
/ 5 \
x = RootOf\_Z + _Z + 1/
I think we could improve on that by using ∊ or ∈ instead of = in Unicode
mode (if that makes sense). The most general way to write it is "x | g(x)
= 0", where g is the polynomial (in this case z**5 + z + 1), so maybe we
should do something like that instead. See for example the docstring of
ratint_logpart in sympy/integrals/rationaltools.py
This would be much clearer than the present printing with the Lambda.
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