Results 201 to 210 of about 5,978,611 (274)

The 1 3 $\frac{1}{3}$‐Conjectures for Domination in Cubic Graphs

open access: yesJournal of Graph Theory, EarlyView.
ABSTRACT A set S $S$ of vertices in a graph G $G$ is a dominating set of G $G$ if every vertex not in S $S$ is adjacent to a vertex in S $S$. The domination number of G $G$, denoted by γ ( G ) $\gamma (G)$, is the minimum cardinality among all dominating sets in G $G$. In a breakthrough paper in 2008, Löwenstein and Rautenbach proved that if G $G$ is a
Paul Dorbec, Michael A. Henning
wiley   +1 more source

The Minimal Nonplanar Strong Digraphs

open access: yesJournal of Graph Theory, EarlyView.
ABSTRACT Kuratowski's theorem says that the minimal (under subgraph containment) graphs that are not planar are the subdivisions of K 5 ${K}_{5}$ and of K 3 , 3 ${K}_{3,3}$. Here we study the minimal (under subdigraph containment) strongly‐connected digraphs that are not planar.
Stephen Bartell, Paul Seymour
wiley   +1 more source

Flow‐Critical Graphs

open access: yesJournal of Graph Theory, EarlyView.
ABSTRACT Lovász et al. proved that every six‐edge‐connected graph has a nowhere‐zero three‐flow. In fact, they proved a more technical statement, which says that there exists a nowhere‐zero three‐flow that extends the flow prescribed on the incident edges of a single vertex z $z$ with bounded degree. We extend this theorem of Lovász et al.
Arnbjörg Soffía Árnadóttir   +5 more
wiley   +1 more source

Recognizing distance-count matrices. [PDF]

open access: yesPLoS One
Boldi P, Prezioso C, Furia F, Stewart I.
europepmc   +1 more source

From Finding a Spanning Subgraph H $H$ to an H $H$‐Factor

open access: yesJournal of Graph Theory, EarlyView.
ABSTRACT A typical Dirac‐type problem in extremal graph theory is to determine the minimum degree threshold for a graph G $G$ to have a spanning subgraph H $H$, for example, the Dirac theorem. A natural follow‐up problem is to seek an H $H$‐factor, which is a spanning set of vertex‐disjoint copies of H $H$.
Allan Lo
wiley   +1 more source

Dasatinib and quercetin prevent alveolar bone loss in aged mice

open access: yesJournal of Periodontology, EarlyView.
Abstract Background Recent findings have associated alveolar bone loss (ABL) with the presence of senescent cells. Aging and the accumulation of senescent cells are associated with a pro‐inflammatory environment which may exacerbate tissue damage.
Luisa S. Battistelli   +7 more
wiley   +1 more source

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