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doc-src/TutorialI/Trie/document/Option2.tex
author paulson
Mon, 22 May 2000 12:30:07 +0200
changeset 8914 e1e4b7313063
parent 8771 026f37a86ea7
child 9145 9f7b8de5bfaf
permissions -rw-r--r--
Proving that multisets are partially ordered New infix syntax for element-hood New theorem size_union
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\begin{isabelle}%
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\isanewline
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\isacommand{datatype}~'a~option~=~None~|~Some~'a\end{isabelle}%
isabelle