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Reachability substitutes for planar digraphs

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons44744

Katriel,  Irit
Algorithms and Complexity, MPI for Informatics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons44874

Kutz,  Martin
Algorithms and Complexity, MPI for Informatics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons45503

Skutella,  Martin
Algorithms and Complexity, MPI for Informatics, Max Planck Society;

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Volltexte (frei zugänglich)

MPI-I-2005-1-002.pdf
(beliebiger Volltext), 303KB

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Zitation

Katriel, I., Kutz, M., & Skutella, M.(2005). Reachability substitutes for planar digraphs (MPI-I-2005-1-002). Saarbrücken: Max-Planck-Institut für Informatik.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0014-6859-0
Zusammenfassung
Given a digraph $G = (V,E)$ with a set $U$ of vertices marked ``interesting,'' we want to find a smaller digraph $\RS{} = (V',E')$ with $V' \supseteq U$ in such a way that the reachabilities amongst those interesting vertices in $G$ and \RS{} are the same. So with respect to the reachability relations within $U$, the digraph \RS{} is a substitute for $G$. We show that while almost all graphs do not have reachability substitutes smaller than $\Ohmega(|U|^2/\log |U|)$, every planar graph has a reachability substitute of size $\Oh(|U| \log^2 |U|)$. Our result rests on two new structural results for planar dags, a separation procedure and a reachability theorem, which might be of independent interest.