
<A NAME=EXP_switch>

<TITLE>EXP_switch</TITLE></A>
<b><a href=r37_idx.html>INDEX</a></b><p><p>



<B>EXP</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>switch</B><P>
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When the <em>exp</em> switch is on, powers and products of expressions are 
expanded. Default is <em>on</em>. 
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 <P> <H3> 
examples: </H3>
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(x+1)**3; 

   3      2
  X  + 3*X  + 3*X + 1 


(a + b*i)*(c + d*i); 

  A*C + A*D*I + B*C*I - B*D 


off exp; 

(x+1)**3; 

         3
  (X + 1)  


(a + b*i)*(c + d*i); 

  (A + B*I)*(C + D*I) 


length((x+1)**2/(y+1)); 

  2

</TT></PRE><P>Note that REDUCE knows that i^2 = -1. 
When <em>exp</em> is off, equivalent expressions may not simplify to the same 
form, although zero expressions still simplify to zero. Several operators 
that expect a polynomial argument behave differently when <em>exp</em> is 
off, such as 
<A HREF=r37_0157.html>length</A>. Be cautious about leaving <em>exp</em> off. 
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