Loop in AS macro

Shane and al,

When I was at school (a long time ago) I learn what was called the "set theory" (
"Theorie des ensembles" in French) that was part of what was called the NEW Mathematics.
In those courses I learned that :

If set A is included in set B and if set B was included in set A then A = B.

Whet your telling me is that there are New New mathematics (as there is a new economy)
in which :

if set A is included in set B and set B included in set A that does not implie A = B.

I am very interrested by that theory and will be happy that you give me some pointers
to it. :-)

Or what is an AS-MACRO ? It is a set of AS (or a set of set of AS ....). So they
have to follow the set theory.



Gilles