doc-src/Tutorial/Misc/Ackermann.thy
author wenzelm
Wed, 24 May 2000 18:04:20 +0200
changeset 8946 40e06237934c
parent 5377 efb799c5ed3c
permissions -rw-r--r--
"done" command;

Ackermann = WF_Rel +
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))"
end