Abstract: MATH/CHEM/COMP 2002, Dubrovnik,
June 2429, 2002

On some primary and
secondary
structures in
combinatorics
Darko Veljan Department of Mathematics, Faculty of Science and Mathematics, University of Zagreb, Bijenička c. 30, HR10002 Zagreb, Croatia We will present some bijective proofs of some well known facts in combinatorics. Some refined structures, e.g. secondary structures will also be discussed. These include Catalan, Motzkin, Narayana and secondary structure numbers from biology. Some logconvexity properties and asymptotics of these numbers will also be presented. 