
diff -r f51d4a302962 -r 5386df44a037 src/Doc/Tutorial/Recdef/Nested0.thy
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Doc/Tutorial/Recdef/Nested0.thy	Tue Aug 28 18:57:32 2012 +0200
@@ -0,0 +1,24 @@
+(*<*)
+theory Nested0 imports Main begin
+(*>*)
+
+text{*
+\index{datatypes!nested}%
+In \S\ref{sec:nested-datatype} we defined the datatype of terms
+*}
+
+datatype ('a,'b)"term" = Var 'a | App 'b "('a,'b)term list"
+
+text{*\noindent
+and closed with the observation that the associated schema for the definition
+of primitive recursive functions leads to overly verbose definitions. Moreover,
+if you have worked exercise~\ref{ex:trev-trev} you will have noticed that
+you needed to declare essentially the same function as @{term"rev"}
+and prove many standard properties of list reversal all over again. 
+We will now show you how \isacommand{recdef} can simplify
+definitions and proofs about nested recursive datatypes. As an example we
+choose exercise~\ref{ex:trev-trev}:
+*}
+
+consts trev  :: "('a,'b)term \<Rightarrow> ('a,'b)term"
+(*<*)end(*>*)




