Vertex intersection graphs of paths on a grid: characterization within block graphs
Weinvestigate graphs that can be represented as vertex intersections of horizontal and vertical paths in a grid, the so called B0-VPG graphs. Recognizing this class is an NP-complete problem. Although, there exists a polynomial time algorithm for recognizing chordal B0-VPG graphs. In this paper, we...
Guardado en:
Autores principales: | , , |
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Formato: | Articulo Preprint |
Lenguaje: | Inglés |
Publicado: |
2017
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Materias: | |
Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/130780 |
Aporte de: |
Sumario: | Weinvestigate graphs that can be represented as vertex intersections of horizontal and vertical paths in a grid, the so called B0-VPG graphs. Recognizing this class is an NP-complete problem. Although, there exists a polynomial time algorithm for recognizing chordal B0-VPG graphs. In this paper, we present a minimal forbidden induced subgraph characterization of B0-VPG graphs restricted to block graphs. As a byproduct, the proof of the main theorem provides an alternative certifying recognition and representation algorithm for B0-VPG graphs in the class of block graphs. |
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