XPost: sci.math   
   From: invalid@invalid.com   
      
   On 9/20/2014 2:49 PM, IV wrote:   
   > I am interested here in *symbolically* given functions, that means in   
   > expressions of some Special functions (Named functions) (Wikipedia:   
   > Special functions), e.g. the Elementary functions (Wikipedia: Elementary   
   > function).   
      
   try just (since it is a function);   
      
      
   y = f(x)   
      
      
      
      
      
      
   > When (under what conditions) is the inverse of a symbolically given   
   > function also a function which can be represented symbolically?   
      
     f−1(f(x)) = x = f(f−1(x))   (the f is followed by superscripted -1   
   meaning inverse, not exponentation)   
      
   thar you go. all done.   
      
      
      
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