Comment #2 on issue 3712 by [email protected]: simplify cancels
inconsistently
http://code.google.com/p/sympy/issues/detail?id=3712
It's because the "simpler expression" does not have a short ops count. If
you pass oo for the ratio you will get
simplify((x-y)*(40*z-20)/10,oo)
4*x*z - 2*x - 4*y*z + 2*y
factor(_)
2*(x - y)*(2*z - 1)
If factor_terms is applied unconditionally to expressions at the outset
then you would get
simplify((x-y)*(40*z-20)/10)
2*(x - y)*(2*z - 1)
simplify((x-y)*(40*z-10)/10)
(x - y)*(4*z - 1)
I've submitted a PR to do this. Let's see if anything breaks in doing so.
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