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doc-src/Tutorial/Misc/Ackermann.thy
author obua
Sun, 09 May 2004 23:04:36 +0200
changeset 14722 8e739a6eaf11
parent 5377 efb799c5ed3c
permissions -rw-r--r--
replaced apply-style proof for instance Multiset :: plus_ac0 by recommended Isar proof style
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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