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<A NAME=boolean_value> <TITLE>boolean_value</TITLE></A> <b><a href=r37_idx.html>INDEX</a></b><p><p> <B>BOOLEAN VALUE</B><P> <P> There are no extra symbols for the truth values true and false. Instead, <A HREF=r37_0014.html>nil</A> and the number zero are interpreted as truth value false in algebraic programs (see <A HREF=r37_0014.html>false</A>), while any different value is considered as true (see <A HREF=r37_0122.html>true</A>). <P> <P>