The competition graph of a doubly partial order is known to be an interval graph. The CCE graph and the niche graph of a doubly partial order are also known to be interval graphs if the graphs do not contain a cycle of length four and three as an induced subgraph, respectively. Phylogeny graphs are variant of competition graphs. The phylogeny graph P(D) of a digraph D is the (simple undirected) graph defined by V (P(D)) := V (D) and E(P(D)) := {xy | N+D (x) ∩ N+D(y) ¹ ⊘ } ⋃ {xy | (x,y) ∈ A(D)}, where N+D(x):= {v ∈ V(D) | (x,v) ∈ A (D)}. In this note, we show that the phylogeny graph of a doubly partial order is an interval graph. We also show that, for any interval graph G̃, there exists an interval graph G such that G̃ contains the graph G as an induced subgraph and that G̃ is the phylogeny graph of a doubly partial order.
@article{bwmeta1.element.doi-10_7151_dmgt_1701,
author = {Boram Park and Yoshio Sano},
title = {The Phylogeny Graphs of Doubly Partial Orders},
journal = {Discussiones Mathematicae Graph Theory},
volume = {33},
year = {2013},
pages = {657-664},
zbl = {1295.05117},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_7151_dmgt_1701}
}
Boram Park; Yoshio Sano. The Phylogeny Graphs of Doubly Partial Orders. Discussiones Mathematicae Graph Theory, Tome 33 (2013) pp. 657-664. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_7151_dmgt_1701/
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