a1 Technische Universität Wien, Wiedner Hauptstraße 8-10, 1040 Wien, Austria; (firstname.lastname@example.org)
a2 University of Calgary, Department of Mathematics and Statistics, 2500 University Dr. NW. Calgary Alberta Canada T2N1N4; (email@example.com)
We determine minimal elements, i.e., atoms, in certain partial orders of factor closed languages under ⊆. This is in analogy to structural Ramsey theory which determines minimal structures in partial orders under embedding.
(Received February 1 2001)
(Accepted September 27 2001)
(Online publication April 15 2002)
Mathematics Subject Classification: