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<B>ASSUMPTIONS</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>variable</B><P>
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After solving a linear or polynomial equation system 
with parameters, the variable <em>assumptions</em> contains a list 
of side relations for the parameters. The solution is valid only 
as long as none of these expression is zero. 
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examples: </H3>
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solve({a*x-b*y+x,y-c},{x,y});

       b*c
  {{x=-----,y=c}} 
      a + 1


assumptions; 

  {a + 1}

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