English
Related papers

Related papers: Oriented diameter of the complete tripartite graph…

200 papers

For a graph $G$, let $\mathbb{D}(G)$ denote the set of all strong orientations of $G$, and the oriented diameter of $G$ is $f(G)=\min \{diam(D) \mid D \in \mathbb{D}(G)\}$, which is the minimum value of the diameters $diam(D)$ where $D \in…

Combinatorics · Mathematics 2025-02-11 Jing Liu , Hui Zhou

Given a connected and bridgeless graph $G$, let $\mathscr{D}(G)$ be the family of strong orientations of $G$. The orientation number of $G$ is defined to be $\bar{d}(G):=min\{d(D)|D\in \mathscr{D}(G)\}$, where $d(D)$ is the diameter of the…

Combinatorics · Mathematics 2021-11-18 W. H. W. Wong , E. G. Tay

The diameter of an undirected or a directed graph is defined to be the maximum shortest path distance over all pairs of vertices in the graph. Given an undirected graph $G$, we examine the problem of assigning directions to each edge of $G$…

Data Structures and Algorithms · Computer Science 2022-03-09 Debajyoti Mondal , N. Parthiban , Indra Rajasingh

In 1978, Chv\'atal and Thomassen showed that every bridgeless graph with diameter 2 has an orientation with diameter at most 6. They also gave general bounds on the smallest value $f(d)$ such that every bridgeless graph $G$ with diameter…

Combinatorics · Mathematics 2011-09-28 Hengzhe Li , Xueliang Li , Yuefang Sun , Jun Yue

A strong orientation of a graph $G$ is an assignment of a direction to each edge such that $G$ is strongly connected. The oriented diameter of $G$ is the smallest diameter among all strong orientations of $G$. A block of $G$ is a maximal…

Combinatorics · Mathematics 2023-08-28 P. Dankelmann , M. J. Morgan , E. J. Rivett-Carnac

Let $G$ be a connected bridgeless graph with domination number $\gamma$. The oriented diameter (strong diameter) of $G$ is the smallest integer $d$ for which $G$ admits a strong orientation with diameter (strong diameter) $d$. Kurz and…

Combinatorics · Mathematics 2025-07-24 Xiaolin Wang , Yaojun Chen

Let $f(d)$ be the smallest value for which every bridgeless graph $G$ with diameter $d$ admits a strong orientation $\overrightarrow{G}$ such that the diameter of $\overrightarrow{G}$ is at most $f(d)$. Chv\'atal and Thomassen (JCT-B, 1978)…

Combinatorics · Mathematics 2025-10-29 Jifu Lin , Lihua You

Erd\H{o}s, Pach, Pollack, and Tuza [\textit{J. Combin. Theory Ser. B, 47(1) (1989), 73-79}] proved that the diameter of a connected $n$-vertex graph with minimum degree $\delta$ is at most $\frac{3n}{\delta+1}+O(1)$. The oriented diameter…

Combinatorics · Mathematics 2025-04-15 Garner Cochran , Zhiyu Wang

In 2018, Dankelmann, Gao, and Surmacs [J. Graph Theory, 88(1): 5--17, 2018] established sharp bounds on the oriented diameter of a bridgeless undirected graph and a bridgeless undirected bipartite graph in terms of vertex degree. In this…

Combinatorics · Mathematics 2025-07-04 Ran An , Hengzhe Li , Jianbing Liu , Gaoxing Sun

An orientation of an undirected graph $G$ is an assignment of exactly one direction to each edge of $G$. The oriented diameter of a graph $G$ is the smallest diameter among all the orientations of $G$. The maximum oriented diameter of a…

Combinatorics · Mathematics 2020-01-30 Jasine Babu , Deepu Benson , Deepak Rajendraprasad , Sai Nishant Vaka

Let $f(d)$ be the smallest value for which every bridgeless graph $G$ with diameter $d$ admits a strong orientation $\overrightarrow{G}$ such that the diameter of $\overrightarrow{G}$ is at most $f(d)$. Chv\'atal and Thomassen (1978)…

Combinatorics · Mathematics 2026-05-13 Jifu Lin , Lihua You

In this paper, we study the oriented diameter of power graphs of groups. We show that a $2$-edge connected power graph of a finite group has oriented diameter at most $4$. We prove that the power graph of the cyclic group of order $n$ has…

Combinatorics · Mathematics 2024-10-15 Deepu Benson , Bireswar Das , Dipan Dey , Jinia Ghosh

An orientation of $G$ is a digraph obtained from $G$ by replacing each edge by exactly one of two possible arcs with the same endpoints. We call an orientation \emph{proper} if neighbouring vertices have different in-degrees. The proper…

Combinatorics · Mathematics 2020-03-18 J. Ai , S. Gerke , G. Gutin , Y. Shi , Z. Taoqiu

We consider the problem of finding an orientation with minimum diameter of a connected bridgeless graph. Fomin et. al. discovered a relation between the minimum oriented diameter an the size of a minimal dominating set. We improve their…

Combinatorics · Mathematics 2008-04-09 Sascha Kurz , Martin Laetsch

In 2015, Dankelmann and Bau proved that for every bridgeless graph $G$ of order $n$ and minimum degree $\delta$ there is an orientation of diameter at most $11\frac{n}{\delta+1}+9$. In 2016, Surmacs reduced this bound to…

Combinatorics · Mathematics 2022-01-20 Garner Cochran

In the first part of this paper we determine the maximum size of a (finite, simple, connected) bipartite graph of given order, diameter $d$, and connectivity $\kappa$. It was shown by Ali, Mazorodze, Mukwembi and Vetr\'ik [On size, order,…

Combinatorics · Mathematics 2025-09-03 Sonwabile Mafunda

A mixed multigraph is a multigraph which may contain both undirected and directed edges. An orientation of a mixed multigraph $G$ is an assignment of exactly one direction to each undirected edge of $G$. A mixed multigraph $G$ can be…

Combinatorics · Mathematics 2021-05-07 Jasine Babu , Deepu Benson , Deepak Rajendraprasad

The diameter of a directed graph is the maximum distance between any pair of vertices. We study a problem that generalizes \textsc{Oriented Diameter}: For a given directed graph and a positive integer $d$, what is the minimum number of arc…

Combinatorics · Mathematics 2025-07-18 Panna Gehér , Max Kölbl , Lydia Mirabel Mendoza-Cadena , Daniel P. Szabo

An orientation of a graph $G$ is proper if any two adjacent vertices have different indegrees. The proper orientation number $\overrightarrow{\chi}(G)$ of a graph $G$ is the minimum of the maximum indegree, taken over all proper…

Let $G$ be a finite simple non-complete connected graph on $[n] = \{1, \ldots, n\}$ and $\kappa(G) \geq 1$ its vertex connectivity. Let $f(G)$ denote the number of free vertices of $G$ and $\mathrm{diam}(G)$ the diameter of $G$. The final…

Combinatorics · Mathematics 2024-09-04 Takayuki Hibi , Sara Saeedi Madani
‹ Prev 1 2 3 10 Next ›