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Inverse of Error Function


I'm trying to find the inverse of the Error function in MMA.

I tried using InverseFunction, like this...

 InverseFunction[Erf[z]]

              (-1)
Out[1]= Erf[z]

But when I tried to find some numerical values i got this ...

In[2]:= % /. z->1 //N

                (-1)
Out[2]= 0.842701

Any help would be appreciated!
regards
Gus
--
Gustav Louw <University of Pretoria, South Africa>



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