Mercurial Mercurial > repos > isabelle / file revision
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | comparison | raw | help
Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
doc-src/Tutorial/Recdef/ack
author nipkow
Fri, 12 Nov 1999 17:45:36 +0100
changeset 8016 b7713108ffd8
parent 6100 40d66bc3e83f
child 9255 2ceb11a2e190
permissions -rw-r--r--
Added the proof by Nielson & Nielson.

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