Re: Temporal database - no end date
Date: 20 Jan 2007 11:53:58 -0800
Message-ID: <1169322838.251008.326040_at_11g2000cwr.googlegroups.com>
[Sets without characteristic functions] What are those sets?
or not.
WHILE (n <> 1)
DO IF odd(n) THEN n := 3n+1 ELSE n:= n/2;
Try it with 27 to see how long one of these things can run. The even numbers all reduce to 1 by inspection. But nobody has yet proved that all the odd numbers also reduce to 1. "The Dynamical System Generated by the 3n+1 Function" Lecture Notes in Mathematics" by Gunther J. Wirsching, (Springer Verlag, 1999) is a good place to start.
There are tons more of these things. But that is really a topic for a Math newsgroup. Received on Sat Jan 20 2007 - 20:53:58 CET