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Published in:
2014 | OriginalPaper | Chapter
The Importance of Being Proper
(In Clustered-Level Planarity and T-Level Planarity)
Authors : Patrizio Angelini, Giordano Da Lozzo, Giuseppe Di Battista, Fabrizio Frati, Vincenzo Roselli
Published in: Graph Drawing
Publisher: Springer Berlin Heidelberg
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In this paper we study two problems related to the drawing of level graphs, that is,
T
-Level Planarity
and
Clustered-Level Planarity
. We show that both problems are
$\mathcal{NP}$
-complete in the general case and that they become polynomial-time solvable when restricted to proper instances.