- xsymbols for
\<noteq> \<notin> \<in> \<exists> \<forall>
\<and> \<inter> \<union> \<Union>
- vector space type of {plus, minus, zero}, overload 0 in vector space
- syntax |.| and ||.||
\begin{isabelle}%
%
\begin{isamarkuptext}%
\noindent
The type \isaindexbold{nat} of natural numbers is predefined and
behaves like%
\end{isamarkuptext}%
\isacommand{datatype}~nat~=~{"}0{"}~|~Suc~nat\end{isabelle}%
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