Posted by sxxx123456 on Thursday, January 15, 2009 at 3:46pm.
Let F be a family of subsets of a set X such that empty set is the element of F. A subset A of X belongs to F1 if and only if either A is a subset of F or complement of A is the subset of F. A subset B of X belongs to F2 if and only if B is a finite intersection of sets in F1. A subset C of X belongs to F3 if and only if C is a finite union of sets in F2. Show that F3 is the smallest algebra which contains F.

smallest algebra  Jenkins, Friday, January 16, 2009 at 9:31pm
Why not try and trick one of your other profs to do this for you?

smallest algebra  sxxx123456, Saturday, January 17, 2009 at 9:11am
becouse they couldn't help me :(