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Erf or Hypergeometric1F1


This is Mma 1.2 on an apollo. 

In[12]:= Hypergeometric1F1[1, 3/2, -z^2]

                              3    2
Out[12]= Hypergeometric1F1[1, -, -z ]
                              2



This is Mma 2.1 on a decstation 5000. 
In[31]:= Hypergeometric1F1[1, 3/2, -z^2]

                           2             2
         -(Sqrt[Pi] Sqrt[-z ] Erf[Sqrt[-z ]])
Out[31]= ------------------------------------
                           2
                          z   2
                       2 E   z

As you can see, it wrote  Hypergeometric1F1
in terms of Erf. I don't want that.
How can I prevent MMa2.1 from converting/simplifying
my  original function ?
        
Thanks.
  
    Roque
    oliveria at caen.engin.umich.edu  





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