Comment #9 on issue 1520 by [email protected]: Inconsistency in subs
http://code.google.com/p/sympy/issues/detail?id=1520
subs is more constistent now and only does the substitution if old is
multiplicatively extractable from expr.
h[2] >>> x.subs(2*x, 1)
x
h[3] >>> (y*x).subs(2*x, 1)
x*y
h[4] >>> (x*y).subs(z*x, 1)
x*y
h[4] >>> (3*x*y).subs(2*x,1)
3*x*y
h[5] >>> (3*x*y).subs(4*x,1)
3*x*y
h[5] >>> (4*x*y).subs(2*x,1) # succeeeds
2*y
h[6] >>> (4*x*y).subs(3*x,1)
4*x*y
Should this be merged into issue 2026?
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