Note: Relationships between the class of unit grid intersection graphs and other classes of bipartite graphs

Authors:
Yota Otachi;Yoshio Okamoto;Koichi Yamazaki
Affiliations:
Department of Computer Science, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan;Department of Information and Computer Sciences, Toyohashi University of Technology, Hibarigaoka 1-1, Tempaku, Toyohashi, Aichi 441-8580, Japan;Department of Computer Science, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan
Venue:
Discrete Applied Mathematics
Year:
2007

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Abstract

We show that the class of unit grid intersection graphs properly includes both of the classes of interval bigraphs and of P"6-free chordal bipartite graphs. We also demonstrate that the classes of unit grid intersection graphs and of chordal bipartite graphs are incomparable.