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Using Heuristics to Arrange Special Functions
Mathematica 7 has sophisticated heuristics and algorithms for arranging all types of special functions.
In[1]:=

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Table[DSolve[y''[x] == y[x] x^n + 1, y[x], x], {n, 4}] // 

  Column // TraditionalForm
Out[1]//TraditionalForm=