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Θ k-graphs are geometric graphs that appear in the context of graph navigation. The shortest-path metric of these graphs is known to approximate the Euclidean complete graph up to a factor depending on the cone number k and the dimension of the space. TD-Delaunay graphs, a.k.a. triangular-distance Delaunay triangulations introduced by Chew, have been shown… (More)

The family of well-orderly maps is a family of planar maps with the property that every connected planar graph has at least one plane embedding which is a well-orderly map. We show that the number of well-orderly maps with n nodes is at most 2 αn+O(log n) , where α ≈ 4.91. A direct consequence of this is a new upper bound on the number p(n) of unlabeled… (More)

We consider the question: " What is the smallest degree that can be achieved for a plane spanner of a Euclidean graph E ? " The best known bound on the degree is 14. We show that E always contains a plane spanner of maximum degree 6 and stretch factor 6. This spanner can be constructed efficiently in linear time given the Triangular Distance Delaunay… (More)

In this paper, we propose an efficient implicit representation of caterpillar and bounded degree trees of n vertices. Our scheme, called Traversal & Jumping, assigns to the n vertices of any bounded degree tree distinct binary labels of log 2 n + O(1) bits in O(n) time such that we can compute adjacency between two vertices only from their labels. We use… (More)

A geometric graph is angle-monotone if every pair of ver-tices has a path between them that—after some rotation—is x-and y-monotone. Angle-monotone graphs are √ 2-spanners and they are increasing chord graphs. Dehkordi, Frati, and Gudmundsson introduced angle-monotone graphs in 2014 and proved that Gabriel triangulations are angle monotone graphs. We give a… (More)

We use Schnyder woods of 3-connected planar graphs to produce convex straight line drawings on a grid of size (n − 2 − ∆) × (n − 2 − ∆). The parameter ∆ ≥ 0 depends on the Schnyder wood used for the drawing. This parameter is in the range 0 ≤ ∆ ≤ n 2 − 2. The algorithm is a refinement of the face-counting-algorithm, thus, in particular, the size of the grid… (More)