Mercurial Mercurial > repos > isabelle / annotate
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/Misc/Ackermann.thy
author wenzelm
Wed, 13 Oct 1999 19:44:15 +0200
changeset 7858 2cd88d1eec0c
parent 5377 efb799c5ed3c
permissions -rw-r--r--
isabelle-isar-ref;
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
5377
efb799c5ed3c *** empty log message ***
nipkow
parents:
diff changeset 
     1
 
Ackermann = WF_Rel +
efb799c5ed3c *** empty log message ***
nipkow
parents:
diff changeset 
     2
 
consts ack :: "nat * nat => nat"
efb799c5ed3c *** empty log message ***
nipkow
parents:
diff changeset 
     3
 
recdef ack "measure(%m. m) ** measure(%n. n)"
efb799c5ed3c *** empty log message ***
nipkow
parents:
diff changeset 
     4
 
"ack(0,n)         = Suc n"
efb799c5ed3c *** empty log message ***
nipkow
parents:
diff changeset 
     5
 
"ack(Suc m,0)     = ack(m, 1)"
efb799c5ed3c *** empty log message ***
nipkow
parents:
diff changeset 
     6
 
"ack(Suc m,Suc n) = ack(m,ack(Suc m,n))"
efb799c5ed3c *** empty log message ***
nipkow
parents:
diff changeset 
     7
 
end
isabelle