Results 71 to 80 of about 433,943 (319)
Planar graphs with $\Delta \geq 7$ and no triangle adjacent to a $C_4$ are minimally edge and total choosable [PDF]
Discrete Mathematics & Theoretical Computer Science, 2016 For planar graphs, we consider the problems of list edge coloring and list total coloring. Edge coloring is the problem of coloring the edges while ensuring that two edges that are adjacent receive different colors.
Marthe Bonamy +2 more
doaj +1 more source
Contact Representations of Graphs in 3D
, 2015 We study contact representations of graphs in which vertices are represented by axis-aligned polyhedra in 3D and edges are realized by non-zero area common boundaries between corresponding polyhedra. We show that for every 3-connected planar graph, there
A Bezdek +17 more
core +1 more source
Equitable Coloring and Equitable Choosability of Planar Graphs without chordal 4- and 6-Cycles [PDF]
Discrete Mathematics & Theoretical Computer Science, 2019 A graph $G$ is equitably $k$-choosable if, for any given $k$-uniform list assignment $L$, $G$ is $L$-colorable and each color appears on at most $\lceil\frac{|V(G)|}{k}\rceil$ vertices.
Aijun Dong, Jianliang Wu
doaj +1 more source
Local Statistics of Realizable Vertex Models [PDF]
, 2010 We study planar "vertex" models, which are probability measures on edge subsets of a planar graph, satisfying certain constraints at each vertex, examples including dimer model, and 1-2 model, which we will define.
C. Boutillier +9 more
core +1 more source
Planar Graphs of Maximum Degree 6 and without Adjacent 8-Cycles Are 6-Edge-Colorable
Journal of Mathematics, 2021 In this paper, by applying the discharging method, we show that if G is a planar graph with a maximum degree of Δ=6 that does not contain any adjacent 8-cycles, then G is of class 1.
Wenwen Zhang
doaj +1 more source
Acyclic colouring of 1-planar graphs
Discrete Applied Mathematics, 2001 A graph is 1-planar if it can be drawn on the plane in such a way that every edge crosses at most one other edge. We prove that the acyclic chromatic number of every 1-planar graph is at most 20.
Oleg V. Borodin +3 more
openaire +2 more sources
, 2017 We study straight-line drawings of graphs where the vertices are placed in convex position in the plane, i.e., convex drawings. We consider two families of graph classes with nice convex drawings: outer $k$-planar graphs, where each edge is crossed by at
AWM Dress +23 more
core +1 more source
Diameter Bounds for Planar Graphs [PDF]
, 2010 The inverse degree of a graph is the sum of the reciprocals of the degrees of its vertices. We prove that in any connected planar graph, the diameter is at most 5/2 times the inverse degree, and that this ratio is tight.
Fulek, Radoslav +2 more
core +2 more sources
Enumerating Hamiltonian Cycles in a Planar Graph Using Combinatorial Cycle Bases
Journal of Applied Computer Science & Mathematics, 2016 Cycle bases belong to a k-connected simple graph used both for listing and enumerating Hamiltonian cycles contained in a planar graph. Planar cycle bases have a weighted induced graph whose weight values limited to 1.
Retno MAHARESI
doaj +1 more source
On RAC drawings of 1-planar graphs
Theoretical Computer Science, 2017 Abstract A drawing of a graph is 1-planar if each edge is crossed at most once. A graph is 1-planar if it has a 1-planar drawing. A k-bend RAC (Right Angle Crossing) drawing of a graph is a polyline drawing where each edge has at most k bends and edges cross only at right angles. A graph is k-bend RAC if it has a k -bend RAC drawing.
Bekos, Michael A. +4 more
openaire +2 more sources