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zerop
![\begin{lstlisting}[language=Scm,stepnumber=2]{}
(define zerop (lambda (n)
((n (lambda(y)
false))
true)))
\end{lstlisting}](img83.gif)
This abstraction is used to check, whether a number is equal
to 0. `true' or `false' is returned respectively. Readers
are referred back to our `apples example' as a help to understand
the code of this abstraction.
Georg P. Loczewski
2004-03-05