Results 61 to 70 of about 842,964 (161)

Strict confluent drawing

open access: yesJournal of Computational Geometry, 2016
We define strict confluent drawing, a form of confluent drawing in which the existence of an edge is indicated by the presence of a smooth path through a system of arcs and junctions (without crossings), and in which such a path, if it exists, must be ...
David Eppstein   +5 more
doaj   +1 more source

Maximal outerplanar graphs as chordal graphs, path-neighborhood graphs, and triangle graphs [PDF]

open access: yes
Maximal outerplanar graphs are characterized using three different classes of graphs. A path-neighborhood graph is a connected graph in which every neighborhood induces a path. The triangle graph $T(G)$ has the triangles of the graph $G$ as its vertices,
Laskar, R.C., Mulder, H.M., Novick, B.
core   +1 more source

The outerplanar crossing number of the complete bipartite graph

open access: yesDiscrete Applied Mathematics, 2022
B. Ábrego, S. Fernández-Merchant
semanticscholar   +1 more source

Nilpotent graphs with crosscap at most two

open access: yesAKCE International Journal of Graphs and Combinatorics, 2018
Let R be a commutative ring with identity. The nilpotent graph of R, denoted by Γ N ( R ) , is a graph with vertex set Z N ( R ) ∗ , and two vertices x and y are adjacent if and only if x y is nilpotent, where Z N ( R ) = { x ∈ R : x y is nilpotent, for ...
A. Mallika, R. Kala
doaj  

Non-Preemptive Tree Packing. [PDF]

open access: yesAlgorithmica, 2023
Lendl S, Woeginger G, Wulf L.
europepmc   +1 more source

Path-Neighborhood Graphs

open access: yesDiscussiones Mathematicae Graph Theory, 2013
A path-neighborhood graph is a connected graph in which every neighborhood induces a path. In the main results the 3-sun-free path-neighborhood graphs are characterized.
Laskar R.C., Mulder Henry Martyn
doaj   +1 more source

On the k-Structure Ratio in Planar and Outerplanar Graphs

open access: yesDiscrete Mathematics & Theoretical Computer Science, 2008
A planar k-restricted structure is a simple graph whose blocks are planar and each has at most k vertices. Planar k-restricted structures are used by approximation algorithms for Maximum Weight Planar Subgraph, which motivates this work. The planar k-
Gruia Calinescu, Cristina G. Fernandes
doaj  

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