XPost: sci.math   
   From: ivgroups@onlinehome.de   
      
   "Peter Percival" wrote in news:ltcr32$j54$1@news.albasani.net...   
   >> Nope.   
   > No.   
   How we do it by hand: If we use the inverse operation (inverse function) of   
   the outer function in each step. (The roots of algebraic functions can be   
   determined numerically or symbolically - e.g. by the Buchberger algorithm.)   
   How is that realized in computer algebra systems, and how powerful/complete   
   are this methods/algorithms?   
      
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