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doc-src/TutorialI/Trie/document/Option2.tex
author
paulson
Thu, 01 Jun 2000 13:28:00 +0200
changeset 9014
4382883421ec
parent 8771
026f37a86ea7
child 9145
9f7b8de5bfaf
permissions
-rw-r--r--
simplified the proof of nth_upt
\begin{isabelle}%
\isanewline
\isacommand{datatype}~'a~option~=~None~|~Some~'a\end{isabelle}%