Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Medium Printing
New issue 2532 by asmeurer: Non-commutative inverses should not print as
fractions
http://code.google.com/p/sympy/issues/detail?id=2532
The notation a/b only makes sense if a and b are commutative. Otherwise,
a*b**-1 and b**-1*a are different animals. Thus, we should not print
inverses of non-commutative symbols as fractions. This leads to some
confusing printing, like
In [22]: a, b = symbols('a b', commutative=False)
In [23]: diff(f(a)**-1, a)
Out[23]:
d
-──(f(a))
da
─────────
f(a)⋅f(a)
In [24]: print diff(f(a)**-1, a)
-Derivative(f(a), a)/(f(a)*f(a))
In [25]: diff(f(a)**-1, a).args
Out[25]:
⎛ 1 d 1 ⎞
⎜-1, ────, ──(f(a)), ────⎟
⎝ f(a) da f(a)⎠
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