rdb@scs.carleton.ca (Robert D. Black) (06/26/91)
A discussion of the hailstone numbers can be found in: "Complexity, Undecidability and Chaos: a Class of Dynamical Systems with Fractal Orbits"; Corrado Agnes and Mario Rasetti. page 3 of: "Workshop on Chaos and Complexity", 1987, edited by R.Livi, S.Ruffo, S.Ciliberto and M.Buiatti. Published by World Scientific (Singapore). Q172.5.C45 W926 The article claims that the hailstone numbers are chaotic, and that the problem of determining whether the sequence terminates in a <1,4,2,1> cycle is undecidable. -- -- Robert Black rdb@scs.carleton.ca School of Computer Science Carleton University, Ottawa, Canada