From: jhl7435@gmail.com   
      
   $ ginsh   
   ginsh - GiNaC Interactive Shell (GiNaC V1.6.5)   
     __,  _______  Copyright (C) 1999-2015 Johannes Gutenberg University Mainz,   
    (__) *       | Germany.  This is free software with ABSOLUTELY NO WARRANTY.   
     ._) i N a C | You are welcome to redistribute it under certain conditions.   
   <-------------' For details type `warranty;'.   
      
   Type ?? for a list of help topics.   
   > a=x;   
   x   
   > b=x+1   
   > ;   
   1+x   
   > s=a/b;   
   (1+x)^(-1)*x   
   > x=2^9;   
   512   
   > s;   
   (1+x)^(-1)*x   
      
   The last line "s;" returns a function form not value, which is different from   
   tutorial.   
      
   TIA   
   James   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)