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doc-src/Tutorial/Misc/Ackermann.thy
author wenzelm
Fri, 21 May 2004 21:26:19 +0200
changeset 14790 0d984ee030a1
parent 5377 efb799c5ed3c
permissions -rw-r--r--
major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
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Ackermann = WF_Rel +
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consts ack :: "nat * nat => nat"
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recdef ack "measure(%m. m) ** measure(%n. n)"
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"ack(0,n)         = Suc n"
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"ack(Suc m,0)     = ack(m, 1)"
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"ack(Suc m,Suc n) = ack(m,ack(Suc m,n))"
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end
isabelle