As I am working on getting tests to pass for a workaround
(https://github.com/sympy/sympy/pull/2780#issuecomment-32575929)
I have run into the following problem:
In [10]: a=sympy.Idx('a')
In [11]: b=sympy.Symbol('b')
In [12]: a*b
Out[12]: b*a
How would you go about to make args of the mul object be alphabetical?
In [13]: m=a*b
In [14]: m.args
Out[14]: (b, a)
i.e. how do we get Out[14]: (a, b)
?
I tried adding this to the Idx class in tensor/indexed.py
@cacheit
def sort_key(self, order=None):
return self.class_key(), (1, (str(self.label),)), S.One.sort_key(),
S.One
But it didn't help. Any suggestions?
Best regards,
/Björn
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