doc-src/TutorialI/Misc/document/fakenat.tex

fixed numerals;

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\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}%
\isacommand{datatype}\ nat\ {\isacharequal}\ {\isadigit{0}}\ {\isacharbar}\ Suc\ nat\end{isabellebody}%
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