Paper Info
Title
Helly EPT graphs on bounded degree trees: forbidden induced subgraphs and efficient recognition.
Abstract
edge intersection graph of a family of paths in host tree is called an $EPT$ graph. When the host tree has maximum degree $h$, we say that $G$ belongs to the class $[h,2,2]$. If, in addition, the family of paths satisfies the Helly property, then $G in$ Helly $[h,2,2]$. The time complexity of the recognition of the classes inside the class $EPT$ is open for every $hu003e 4$. Golumbic et al. wonder if the only obstructions for an $EPT$ graph belonging to $[h,2,2]$ are the chordless cycles $C_n$ for $nu003e h$. In the present paper, we give a negative answer to that question, we present a family of $EPT$ graphs which are forbidden induced subgraphs for the classes $[h,2,2]$. Using them we obtain a total characterization by induced forbidden subgraphs of the classes Helly $[h,2,2]$ for $hgeq 4$ inside the class $EPT$. As a byproduct, we prove that Helly $EPT$$cap [h,2,2]=$ Helly $[h,2,2]$. We characterize Helly $[h,2,2]$ graphs by their atoms in the decomposition by clique separators. We give an efficient algorithm to recognize Helly $[h,2,2]$ graphs.
Year
Venue
Field
2016
arXiv: Combinatorics
Discrete mathematics,Graph,Combinatorics,Intersection graph,Clique separators,Negative - answer,Degree (graph theory),Time complexity,Mathematics,Bounded function
DocType
Volume
Citations 
Journal
abs/1604.08775
0
PageRank 
References 
Authors
0.34
0
3
Name
Order
Citations
PageRank
Liliana Alcón15914.43
Marisa Gutierrez24112.90
M. P. Mazzoleni3124.05