From 95c7f84ddf4d20a05350924f5dd3ad4fb7c430f2 Mon Sep 17 00:00:00 2001 From: Guillaume Saupin Date: Wed, 29 Feb 2012 17:09:34 +0100 Subject: [PATCH] Try to fix issue. --- sympy/core/mul.py | 10 ++++++---- 1 files changed, 6 insertions(+), 4 deletions(-) diff --git a/sympy/core/mul.py b/sympy/core/mul.py index 3bcca7e..a169994 100644 --- a/sympy/core/mul.py +++ b/sympy/core/mul.py @@ -264,12 +264,13 @@ def flatten(cls, seq): o1 = nc_part.pop() b1,e1 = o1.as_base_exp() b2,e2 = o.as_base_exp() - new_exp = e1 + e2 # Only allow powers to combine if the new exponent is # not an Add. This allow things like a**2*b**3 == a**5 # if a.is_commutative == False, but prohibits # a**x*a**y and x**a*x**b from combining (x,y commute). - if b1==b2 and (not new_exp.is_Add): + if b1==b2 : + new_exp = e1 + e2 + if not new_exp.is_Add: o12 = b1 ** new_exp # now o12 could be a commutative object @@ -278,7 +279,9 @@ def flatten(cls, seq): continue else: nc_seq.insert(0, o12) - + else: + nc_part.append(o1) + nc_part.append(o) else: nc_part.append(o1) nc_part.append(o) @@ -492,7 +495,6 @@ def _handle_for_oo(c_part, coeff_sign): def _eval_power(b, e): - # don't break up NC terms: (A*B)**3 != A**3*B**3, it is A*B*A*B*A*B coeff, b = b.as_coeff_Mul() bc, bnc = b.args_cnc() -- 1.7.9