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Journal of Graph Algorithms and Applications
Article . 2013 . Peer-reviewed
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Planar Graphs as VPG-Graphs

Planar graphs as VPG-graphs
Authors: Steven Chaplick; Torsten Ueckerdt;

Planar Graphs as VPG-Graphs

Abstract

Summary: A graph is \(B_k\)-VPG when it has an intersection representation by paths in a rectangular grid with at most \(k\) bends (turns). It is known that all planar graphs are \(B_3\)-VPG and this was conjectured to be tight. We disprove this conjecture by showing that all planar graphs are \(B_2\)-VPG. We also show that the 4-connected planar graphs constitute a subclass of the intersection graphs of Z-shapes (i.e., a special case of \(B_2\)-VPG). Additionally, we demonstrate that a \(B_2\)-VPG representation of a planar graph can be constructed in \(O(n^{3/2})\) time. We further show that the triangle-free planar graphs are contact graphs of: L-shapes, {\(\Gamma\)}-shapes, vertical segments, and horizontal segments (i.e., a special case of contact \(B_1\)-VPG). From this proof we obtain a new proof that bipartite planar graphs are a subclass of 2-DIR.

Country
Netherlands
Related Organizations
Keywords

Graph algorithms (graph-theoretic aspects), Graph representations (geometric and intersection representations, etc.), Planar graphs; geometric and topological aspects of graph theory

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    popularity
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    influence
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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
17
Top 10%
Top 10%
Top 10%
gold