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<B>FALSE</B><P>
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The symbol 
<A HREF=r37_0014.html>nil</A> and the number zero are considered 
as 
<A HREF=r37_0109.html>boolean value</A> false if used in a place where 
a boolean value is required. Most builtin operators return 

<A HREF=r37_0014.html>nil</A> as false value. Algebraic programs use better zero
. 
Note that <em>nil</em> is not printed when returned as result to 
a top level evaluation. 
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