Comment #13 on issue 1731 by smichr: fraction can be more flexible http://code.google.com/p/sympy/issues/detail?id=1731
The big difference between fraction and as_numer_denom is that fraction just gives the naive numer/denom fraction(x/(1+1/b)) -> (x, 1 + 1/b) whereas as_numer_denom gives the fully denested fraction parts: (b*x, 1 + b).
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