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doc-src/Tutorial/Recdef/ack
author paulson
Mon, 22 May 2000 12:30:40 +0200
changeset 8915 80303d9b0d7b
parent 6100 40d66bc3e83f
child 9255 2ceb11a2e190
permissions -rw-r--r--
Proving that multisets are partially ordered New infix syntax for element-hood

consts ack :: "nat*nat => nat"
recdef ack "measure(%m. m) ** 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