A Steiner general position problem in graph theory

نویسندگان

چکیده

Let G be a graph. The Steiner distance of $$W\subseteq V(G)$$ is the minimum size connected subgraph containing W. Such necessarily tree called W-tree. set $$A\subseteq k-Steiner general position if $$V(T_B)\cap A = B$$ holds for every $$B\subseteq A$$ cardinality k, and B-tree $$T_B$$ . number $$\mathrm{sgp}_k(G)$$ largest in G. cliques are introduced used to bound from below. determined trees, cycles joins graphs. Lower bounds presented split graphs, infinite grids lexicographic products. lower latter product leads an exact formula arbitrary product.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

The graph theory general position problem on some interconnection networks

Given a graph G, the (graph theory) general position problem is to find the maximum number of vertices such that no three vertices lie on a common geodesic. This graph invariant is called the general position number (gpnumber for short) of G and denoted by gp(G). In this paper, the gp-number is determined for a large class of subgraphs of the infinite grid graph and for the infinite diagonal gr...

متن کامل

The Steiner diameter of a graph

‎The Steiner distance of a graph‎, ‎introduced by Chartrand‎, ‎Oellermann‎, ‎Tian and Zou in 1989‎, ‎is a natural generalization of the‎ ‎concept of classical graph distance‎. ‎For a connected graph $G$ of‎ ‎order at least $2$ and $Ssubseteq V(G)$‎, ‎the Steiner‎ ‎distance $d(S)$ among the vertices of $S$ is the minimum size among‎ ‎all connected subgraphs whose vertex sets contain $S$‎. ‎Let $...

متن کامل

The General Steiner Tree-Star problem

The Steiner tree problem is deened as follows-given a graph G = (V; E) and a subset X V of terminals, compute a minimum cost tree that includes all nodes in X. Furthermore, it is reasonable to assume that the edge costs form a metric. This problem is NP-hard and has been the study of many heuristics and algorithms. We study a generalization of this problem, where there is a \switch" cost in add...

متن کامل

On a problem in extremal graph theory

The number T*(n, k) is the least positive integer such that every graph with n = (*:I) + t vertices (t > 0) and at least T*(n, k) edges contains k mutually vertex-disjoint complete subgraphs S, , S, ,..., Sk where S, has ivertices, I < i Q k. Obviously T*(n, k) > T(n, k), the Turan number of edges for a Ki . It is shown that if n > gkk” then equality holds and that there is c :0 such that for (...

متن کامل

The general Steiner problem in Boolean space and application

Ting, S.-T. and S.-Y. Zhao, The general Steiner problem in Boolean space and application, Discrete Mathematics 90 (1991) 75-84. The Steiner problem is to find the minimum point P of sum of distances C;=‘=,p=@(P)whereP,i=l,..., n, are given points in Euclidean plane. It is solved for n = 3, [l]. When n > 3 even approximation is unsatisfactory [3]. In Boolean space the distance of Boolean points ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Computational & Applied Mathematics

سال: 2021

ISSN: ['1807-0302', '2238-3603']

DOI: https://doi.org/10.1007/s40314-021-01619-y