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doc-src/Tutorial/Recdef/ack
author paulson
Mon, 02 Feb 2004 12:23:46 +0100
changeset 14371 c78c7da09519
parent 9255 2ceb11a2e190
permissions -rw-r--r--
Conversion of HyperNat to Isar format and its declaration as a semiring

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))"
isabelle