Full_Name: Sergio Lupi Version: 1.52 OS: Linux Suse 6.4 Submission from: (NULL) (195.78.220.33) very simple: try this: >>> 0.14-0.13 == 0.13-0.12 1 so far so good, but >>> 0.13-0.12 == 0.12-0.11 0 There are some combinations of numbers (they are many indeed) that mess things up. This has been tested on several PCs under Linux and NT