Artifact 92d6e4c353cbf973b4f6ca43a6c3f66692e26f6f97fecb5504ead9e516cd1543:

• File psl-1983/3-1/tests/tak.sl — part of check-in [eb17ceb7f6] at 2020-04-21 19:40:01 on branch master — Add Reduce 3.0 to the historical section of the archive, and some more
  files relating to version sof PSL from the early 1980s. Thanks are due to
  Paul McJones and Nelson Beebe for these, as well as to all the original
  authors.

  git-svn-id: https://svn.code.sf.net/p/reduce-algebra/code/historical@5328 2bfe0521-f11c-4a00-b80e-6202646ff360 (user: arthurcnorman@users.sourceforge.net, size: 166) [annotate] [blame] [check-ins using] [more...]

(de topleveltak (x y z) (tak x y z))

(de tak (x y z)
  (cond ((null (ilessp y x))  z)
	(t (tak (tak (isub1 x) y z)
		(tak (isub1 y) z x)
		(tak (isub1 z) x y)))))