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• # Artykuł - szczegóły

## Discussiones Mathematicae Graph Theory

2013 | 33 | 4 | 657-664

## The Phylogeny Graphs of Doubly Partial Orders

EN

### Abstrakty

EN
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.

EN

657-664

wydano
2013-09-01
online
2013-10-15

### Twórcy

autor
• National Institute for Mathematical Sciences Daejeon 305-811, Korea
autor
• Division of Information Engineering Faculty of Engineering, Information and Systems University of Tsukuba Ibaraki 305-8573, Japan

### Bibliografia

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