Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 2177 by [email protected]: Subs for noncommutative symbols
gives wrong results
http://code.google.com/p/sympy/issues/detail?id=2177
Im having trouble with subs for noncommutative symbols, both with sympy
0.6.7 as well as the latest git version. Subs seems to give the wrong
results in certain situations where the symbols are noncommutative, e.g. in
the following case:
import sympy
a, b, c = sympy.symbols('a b c', commutative = False)
#a, b, c = sympy.symbols('a b c', commutative = True)
x = a**2*b**2
print x.subs(a*b**2, c)
(compare the difference when the symbols are commutative and noncommutative)
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