Hello! Where is the module math? Or what is its special character? It's not in Lib (as for instance string), but its also not built-in. Like cmath, os, sys, ... ? [Perhaps it is, that they are written in C, do they constitute dlls or what?] What's the special character of those modules, is there a list of modules of that type and where can they be found (where are they hidden?) Thanks, Gregor