.. the single track.fi A A 34. John Lucas, ficeMinds, Machines, and GAIldel,fi in Kenneth M. Sayre and Frederick J. Crosson (eds.), The Modeling of Mind Computers and Intelligence (New York: Simon and Schuster, Inc., 1968), p. 255. for any formal system . . . within the system. A A 35. Norbert Wiener, Cybernetics (Cambridge,