Comment #2 on issue 2177 by [email protected]: Subs for noncommutative
symbols gives wrong results
http://code.google.com/p/sympy/issues/detail?id=2177
Issue 2039 which is now blocked by the series work in pull/61 fixes this.
h[1] >>> a, b, c = symbols('a b c', commutative
h[1] >>> (a**2*b**2).subs(a*b**2,c)
a*c
h[2] >>> var('a b c')
(a, b, c)
h[3] >>> (a**2*b**2).subs(a*b**2,c)
a*c
h[4] >>> a.is_commutative
True
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