Status: Accepted
Owner: [email protected]
Labels: Type-Defect Priority-Medium
New issue 2725 by [email protected]: negated sub-expression match in Add
doesn't substitute
http://code.google.com/p/sympy/issues/detail?id=2725
Previously, the following didn't change. Along with the other changes of
https://github.com/sympy/sympy/pull/234 this now works as shown below.
>>> (a+b+c).subs(-a-b,1)
c - 1
It also allows for a rudimentary implementation of 'exact' matching:
>>> ((x+1)**2).subs(x+2,y,exact=True)
(x + 1)**2
>>> ((x+1)**2).subs(x+2,y)
(y - 1)**2
I believe I have addressed the concerns that were raised about this pull
request and would like to not have to rebase it again. Can I get some
review help on this?
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