IV  wrote:   
   > Hallo,   
   >   
   > why are many equations not solvable by applying only Elementary functions?   
   > Elementary functions: Wikipedia - Elementary function:   
   > https://en.wikipedia.org/wiki/Elementary_function   
   >   
   > Let us discuss this on the example equation x + e^x = 0, x real.   
      
   There are answers at:   
      
   http://mathoverflow.net/questions/135911/how-to-prove-lamberts-w   
   function-is-not-elementary   
      
   It seems that one answer is yours...   
      
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                                 Waldek Hebisch   
      
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