Comment #1 on issue 3862 by [email protected]: rcollect doesn't work as
expected
http://code.google.com/p/sympy/issues/detail?id=3862
...or more succinctly,
n,d=[horner(i) for i in fraction(eq)]; pprint(n/d)
a0*(a1*(a2*(a3*a4 + 1) + a4) + a3*a4 + 1) + a2*(a3*a4 + 1) + a4
---------------------------------------------------------------
a1*(a2*(a3*a4 + 1) + a4) + a3*a4 + 1
I suspect that rcollect could work better, however. Perhaps by running
collect on subexpressions that are Adds rather than on the entire Add
itself.
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