Changed order of prems in finprod_cong. Slight speedup.
%
\begin{isabellebody}%
\def\isabellecontext{fakenat}%
\isamarkupfalse%
%
\begin{isamarkuptext}%
\noindent
The type \tydx{nat} of natural
numbers is predefined to have the constructors \cdx{0} and~\cdx{Suc}. It behaves as if it were declared like this:%
\end{isamarkuptext}%
\isamarkuptrue%
\isacommand{datatype}\ nat\ {\isacharequal}\ {\isadigit{0}}\ {\isacharbar}\ Suc\ nat\isamarkupfalse%
\isamarkupfalse%
\end{isabellebody}%
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