Department of Mathematics
Applying the recently obtained distributive lattice structure on the set of 1-factors, we show that the resonance graphs of any benzenoid systems G, as well as of general plane (weakly) elementary bipartite graphs, are median graphs and thus extend greatly Klavžar et al.'s result. The n-dimensional vectors of nonnegative integers as a labelling for the 1-factors of G with n inner faces are described. The labelling preserves the partial ordering of the above-mentioned lattice and can be transformed into a binary coding for the 1-factors. A simple criterion for such a labelling being binary is given. In particular, Klavžar et al.'s algorithm is modified to generate this binary coding for the 1-factors of a cata-condensed benzenoid system.
1-factor, benzenoid system, distributive lattice, resonance graph, Z-transformation graph, binary coding, median graph
Source Publication Title
SIAM Journal on Discrete Mathematics
Society for Industrial and Applied Mathematics
Link to Publisher's Edition
Zhang, Heping, Peter Che Bor Lam, and Wai Chee Shiu. "Resonance graphs and a binary coding for the 1-factors of benzenoid systems." SIAM Journal on Discrete Mathematics 22.3 (2008): 971-984.