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Wyświetlanie 1-9 z 9
Tytuł:
Connected odd dominating sets in graphs
Autorzy:
Caro, Yair
Klostermeyer, William
Yuster, Raphael
Powiązania:
https://bibliotekanauki.pl/articles/744351.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
dominating set
odd dominating set
Opis:
An odd dominating set of a simple, undirected graph G = (V,E) is a set of vertices D ⊆ V such that |N[v] ∩ D| ≡ 1 mod 2 for all vertices v ∈ V. It is known that every graph has an odd dominating set. In this paper we consider the concept of connected odd dominating sets. We prove that the problem of deciding if a graph has a connected odd dominating set is NP-complete. We also determine the existence or non-existence of such sets in several classes of graphs. Among other results, we prove there are only 15 grid graphs that have a connected odd dominating set.
Źródło:
Discussiones Mathematicae Graph Theory; 2005, 25, 3; 225-239
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Wiener number of Kneser graphs
Autorzy:
Balakrishnan, Rangaswami
Raj, S.
Powiązania:
https://bibliotekanauki.pl/articles/743309.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Wiener number
Kneser graph
odd graph
Opis:
The Wiener number of a graph G is defined as 1/2∑d(u,v), where u,v ∈ V(G), and d is the distance function on G. The Wiener number has important applications in chemistry. We determine the Wiener number of an important family of graphs, namely, the Kneser graphs.
Źródło:
Discussiones Mathematicae Graph Theory; 2008, 28, 2; 219-228
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Odd and residue domination numbers of a graph
Autorzy:
Caro, Yair
Klostermeyer, William
Goldwasser, John
Powiązania:
https://bibliotekanauki.pl/articles/743442.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
dominating set
odd dominating set
parity domination
Opis:
Let G = (V,E) be a simple, undirected graph. A set of vertices D is called an odd dominating set if |N[v] ∩ D| ≡ 1 (mod 2) for every vertex v ∈ V(G). The minimum cardinality of an odd dominating set is called the odd domination number of G, denoted by γ₁(G). In this paper, several algorithmic and structural results are presented on this parameter for grids, complements of powers of cycles, and other graph classes as well as for more general forms of "residue" domination.
Źródło:
Discussiones Mathematicae Graph Theory; 2001, 21, 1; 119-136
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On well-covered graphs of odd girth 7 or greater
Autorzy:
Randerath, Bert
Vestergaard, Preben
Powiązania:
https://bibliotekanauki.pl/articles/743557.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
well-covered
independence number
domination number
odd girth
Opis:
A maximum independent set of vertices in a graph is a set of pairwise nonadjacent vertices of largest cardinality α. Plummer [14] defined a graph to be well-covered, if every independent set is contained in a maximum independent set of G. One of the most challenging problems in this area, posed in the survey of Plummer [15], is to find a good characterization of well-covered graphs of girth 4. We examine several subclasses of well-covered graphs of girth ≥ 4 with respect to the odd girth of the graph. We prove that every isolate-vertex-free well-covered graph G containing neither C₃, C₅ nor C₇ as a subgraph is even very well-covered. Here, a isolate-vertex-free well-covered graph G is called very well-covered, if G satisfies α(G) = n/2. A vertex set D of G is dominating if every vertex not in D is adjacent to some vertex in D. The domination number γ(G) is the minimum order of a dominating set of G. Obviously, the inequality γ(G) ≤ α(G) holds. The family $_{γ=α}$ of graphs G with γ(G) = α(G) forms a subclass of well-covered graphs. We prove that every connected member G of $_{γ=α}$ containing neither C₃ nor C₅ as a subgraph is a K₁, C₄,C₇ or a corona graph.
Źródło:
Discussiones Mathematicae Graph Theory; 2002, 22, 1; 159-172
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimal Graphs with Respect to Geometric Distance Realizability
Autorzy:
Madaras, Tomáš
Široczki, Pavol
Powiązania:
https://bibliotekanauki.pl/articles/32083776.pdf
Data publikacji:
2021-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
unit-distance graph
odd-distance graph
Euclidean plane
Opis:
A graph G is minimal non-unit-distance graph if there is no drawing of G in Euclidean plane having all edges of unit length, but, for each edge e of G, G − e has such a drawing. We prove that, for infinitely many n, the number of non-isomorphic n-vertex minimal non-unit-distance graphs is at least exponential in n.
Źródło:
Discussiones Mathematicae Graph Theory; 2021, 41, 1; 65-73
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
One-Three Join: A Graph Operation and Its Consequences
Autorzy:
Shalu, M.A.
Devi Yamini, S.
Powiązania:
https://bibliotekanauki.pl/articles/31341697.pdf
Data publikacji:
2017-08-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
one-three join
bipartite-join
homogeneous set
odd hole-free graphs
Opis:
In this paper, we introduce a graph operation, namely one-three join. We show that the graph G admits a one-three join if and only if either G is one of the basic graphs (bipartite, complement of bipartite, split graph) or G admits a constrained homogeneous set or a bipartite-join or a join. Next, we define ℳH as the class of all graphs generated from the induced subgraphs of an odd hole-free graph H that contains an odd anti-hole as an induced subgraph by using one-three join and co-join recursively and show that the maximum independent set problem, the maximum clique problem, the minimum coloring problem, and the minimum clique cover problem can be solved efficiently for ℳH.
Źródło:
Discussiones Mathematicae Graph Theory; 2017, 37, 3; 633-647
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On perfectness of intersection graph of ideals of ℤn
Autorzy:
Das, Angsuman
Powiązania:
https://bibliotekanauki.pl/articles/38889404.pdf
Data publikacji:
2017-12-20
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
intersection graph
strong perfect graph theorem
weakly triangulated graph
induced odd cycle
Opis:
In this short paper, we characterize the positive integers n for which intersection graph of ideals of ℤn is perfect.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2017, 37, 2; 119-126
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On {a, b}-Edge-Weightings of Bipartite Graphs with Odd a, b
Autorzy:
Bensmail, Julien
Inerney, Fionn Mc
Lyngsie, Kasper Szabo
Powiązania:
https://bibliotekanauki.pl/articles/32361745.pdf
Data publikacji:
2022-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
neighbour-sum-distinguishing edge-weightings
bipartite graphs
odd weights
1-2-3 Conjecture
Opis:
For any S ⊂ ℤ we say that a graph G has the S-property if there exists an S-edge-weighting w : E(G) → S such that for any pair of adjacent vertices u, v we have ∑e∈E(v) w(e) ≠ ∑e∈E(u) w(e), where E(v) and E(u) are the sets of edges incident to v and u, respectively. This work focuses on {a, a+2}-edge-weightings where a ∈ ℤ is odd. We show that a 2-connected bipartite graph has the {a, a+2}-property if and only if it is not a so-called odd multi-cactus. In the case of trees, we show that only one case is pathological. That is, we show that all trees have the {a, a+2}-property for odd a ≠ −1, while there is an easy characterization of trees without the {−1, 1}-property.
Źródło:
Discussiones Mathematicae Graph Theory; 2022, 42, 1; 159-185
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maximum Edge-Colorings Of Graphs
Autorzy:
Jendrol’, Stanislav
Vrbjarová, Michaela
Powiązania:
https://bibliotekanauki.pl/articles/31341153.pdf
Data publikacji:
2016-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
edge-coloring
r -maximum k -edge-coloring
unique-maximum edge-coloring
weak-odd edge-coloring
weak-even edge-coloring
Opis:
An $r$-maximum $k$-edge-coloring of $G$ is a $k$-edge-coloring of $G$ having a property that for every vertex $v$ of degree $d_G(v) = d, d \ge r$, the maximum color, that is present at vertex $v$, occurs at $v$ exactly $r$ times. The $r$-maximum index $ \chi_r^′ (G) $ is defined to be the minimum number $k$ of colors needed for an $r$-maximum $k$-edge-coloring of graph $G$. In this paper we show that $ \chi_r^′ (G) \le 3 $ for any nontrivial connected graph $G$ and $ r = 1$ or 2. The bound 3 is tight. All graphs $G$ with $ \chi_1^' (G) =i $, $i = 1, 2, 3$ are characterized. The precise value of the $r$-maximum index, $ r \ge 1 $, is determined for trees and complete graphs.
Źródło:
Discussiones Mathematicae Graph Theory; 2016, 36, 1; 117-125
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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