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doc-src/Tutorial/Misc/Ackermann.thy
author nipkow
Tue, 17 Apr 2001 16:54:38 +0200
changeset 11256 49afcce3bada
parent 5377 efb799c5ed3c
permissions -rw-r--r--
*** empty log message ***

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
isabelle