The current method for transforming sympy trees (used in the
printers, for example) can require some nested if-tests, even for some
simple cases like subtraction (addition of -1 multiplied by the first
arg), or division (mutiply by arg to the power of -1).
It would be nice to be able to represent
Hello.
That's look very good. This would also allow to build customized math tree
from sympy tree.
C.
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