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%
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\begin{isabellebody}%
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\def\isabellecontext{Nested{\isadigit{1}}}%
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%
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\begin{isamarkuptext}%
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\noindent
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Although the definition of \isa{trev} below is quite natural, we will have
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to overcome a minor difficulty in convincing Isabelle of its termination.
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It is precisely this difficulty that is the \textit{raison d'\^etre} of
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this subsection.
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Defining \isa{trev} by \isacommand{recdef} rather than \isacommand{primrec}
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simplifies matters because we are now free to use the recursion equation
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suggested at the end of \S\ref{sec:nested-datatype}:%
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\end{isamarkuptext}%
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\isacommand{recdef}\ \end{isabellebody}%
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%%% Local Variables:
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%%% mode: latex
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%%% TeX-master: "root"
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%%% End:
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