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doc-src/Tutorial/Recdef/ack
author paulson
Tue, 14 Nov 2000 17:02:36 +0100
changeset 10468 87dda999deca
parent 9255 2ceb11a2e190
permissions -rw-r--r--
first version of Advanced Inductive Defs section

consts ack :: "nat*nat => nat"
recdef ack "measure(%m. m) <*lex*> measure(%n. n)"
  "ack(0,n)         = Suc n"
  "ack(Suc m,0)     = ack(m, 1)"
  "ack(Suc m,Suc n) = ack(m,ack(Suc m,n))"
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