Comment #4 on issue 2552 by [email protected]: (1/(x*y)).subs(x*y, whatever)
doesn't work
http://code.google.com/p/sympy/issues/detail?id=2552
A step forward on this might be to change as_base_exp so that a Mul of
bases to the same Integer exponent (which automatically gets separated at
instantiation) would come back as a Mul base to that Integer,
not
>>> 1/x/y
1/(x*y)
>>> _.as_base_exp()
(1/(x*y), 1)
but
(x*y, -1)
This wouldn't solve a problem like a replacement of `x*y` in `1/x**2/y**3`
but that is a case where I really don't like the automatic algebraic logic
of the current subs anyway as I've noted in other issues.
It looks like I had the last crack at Mul's _eval_subs. Does somebody else
want to try the next round?
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