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Wyświetlanie 1-10 z 10
Tytuł:
Optimal Backbone Coloring of Split Graphs with Matching Backbones
Autorzy:
Turowski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/31339140.pdf
Data publikacji:
2015-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
backbone coloring
split graphs
matching
Opis:
For a graph $G$ with a given subgraph $H$, the backbone coloring is defined as the mapping $c : V(G) → \mathbb{N}_+$ such that $|c(u) − c(v)| ≥ 2$ for each edge ${u, v} ∈ E(H)$ and $|c(u) − c(v)| ≥ 1$ for each edge ${u, v} ∈ E(G)$. The backbone chromatic number $BBC(G,H)$ is the smallest integer $k$ such that there exists a backbone coloring with \(max_{v∈V(G)} c(v) = k\). In this paper, we present the algorithm for the backbone coloring of split graphs with matching backbone.
Źródło:
Discussiones Mathematicae Graph Theory; 2015, 35, 1; 157-169
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A classification for maximal nonhamiltonian Burkard-Hammer graphs
Autorzy:
Tan, Ngo
Iamjaroen, Chawalit
Powiązania:
https://bibliotekanauki.pl/articles/743509.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
split graph
Burkard-Hammer condition
Burkard-Hammer graph
hamiltonian graph
maximal nonhamiltonian split graph
Opis:
A graph G = (V,E) is called a split graph if there exists a partition V = I∪K such that the subgraphs G[I] and G[K] of G induced by I and K are empty and complete graphs, respectively. In 1980, Burkard and Hammer gave a necessary condition for a split graph G with |I| < |K| to be hamiltonian. We will call a split graph G with |I| < |K| satisfying this condition a Burkard-Hammer graph. Further, a split graph G is called a maximal nonhamiltonian split graph if G is nonhamiltonian but G+uv is hamiltonian for every uv ∉ E where u ∈ I and v ∈ K. Recently, Ngo Dac Tan and Le Xuan Hung have classified maximal nonhamiltonian Burkard-Hammer graphs G with minimum degree δ(G) ≥ |I|- 3. In this paper, we classify maximal nonhamiltonian Burkard-Hammer graphs G with |I| ≠ 6,7 and δ(G) = |I| - 4.
Źródło:
Discussiones Mathematicae Graph Theory; 2008, 28, 1; 67-89
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Backbone colorings along stars and matchings in split graphs: their span is close to the chromatic number
Autorzy:
Broersma, Hajo
Marchal, Bert
Paulusma, Daniel
Salman, A.
Powiązania:
https://bibliotekanauki.pl/articles/743123.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
backbone coloring
split graph
matching
star
Opis:
We continue the study on backbone colorings, a variation on classical vertex colorings that was introduced at WG2003. Given a graph G = (V,E) and a spanning subgraph H of G (the backbone of G), a λ-backbone coloring for G and H is a proper vertex coloring V→ {1,2,...} of G in which the colors assigned to adjacent vertices in H differ by at least λ. The algorithmic and combinatorial properties of backbone colorings have been studied for various types of backbones in a number of papers. The main outcome of earlier studies is that the minimum number l of colors, for which such colorings V→ {1,2,...,l} exist, in the worst case is a factor times the chromatic number (for path, tree, matching and star backbones). We show here that for split graphs and matching or star backbones, l is at most a small additive constant (depending on λ) higher than the chromatic number. Our proofs combine algorithmic and combinatorial arguments. We also indicate other graph classes for which our results imply better upper bounds on l than the previously known bounds.
Źródło:
Discussiones Mathematicae Graph Theory; 2009, 29, 1; 143-162
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hamilton cycles in split graphs with large minimum degree
Autorzy:
Tan, Ngo
Hung, Le
Powiązania:
https://bibliotekanauki.pl/articles/744406.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Hamilton cycle
split graph
bipartite graph
Opis:
A graph G is called a split graph if the vertex-set V of G can be partitioned into two subsets V₁ and V₂ such that the subgraphs of G induced by V₁ and V₂ are empty and complete, respectively. In this paper, we characterize hamiltonian graphs in the class of split graphs with minimum degree δ at least |V₁| - 2.
Źródło:
Discussiones Mathematicae Graph Theory; 2004, 24, 1; 23-40
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Splitting Cubic Circle Graphs
Autorzy:
Traldi, Lorenzo
Powiązania:
https://bibliotekanauki.pl/articles/31340797.pdf
Data publikacji:
2016-08-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
circle graph
split decomposition
regular graph
Opis:
We show that every 3-regular circle graph has at least two pairs of twin vertices; consequently no such graph is prime with respect to the split decomposition. We also deduce that up to isomorphism, K4 and K3,3 are the only 3-connected, 3-regular circle graphs.
Źródło:
Discussiones Mathematicae Graph Theory; 2016, 36, 3; 723-741
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Representing Split Graphs by Words
Autorzy:
Chen, Herman Z.Q.
Kitaev, Sergey
Saito, Akira
Powiązania:
https://bibliotekanauki.pl/articles/32222537.pdf
Data publikacji:
2022-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
split graph
word-representability
semi-transitive orientation
Opis:
There is a long line of research in the literature dedicated to word-representable graphs, which generalize several important classes of graphs. However, not much is known about word-representability of split graphs, another important class of graphs. In this paper, we show that threshold graphs, a subclass of split graphs, are word-representable. Further, we prove a number of general theorems on word-representable split graphs, and use them to characterize computationally such graphs with cliques of size 5 in terms of nine forbidden subgraphs, thus extending the known characterization for word-representable split graphs with cliques of size 4. Moreover, we use split graphs, and also provide an alternative solution, to show that gluing two word-representable graphs in any clique of size at least 2 may, or may not, result in a word-representable graph. The two surprisingly simple solutions provided by us answer a question that was open for about ten years.
Źródło:
Discussiones Mathematicae Graph Theory; 2022, 42, 4; 1263-1280
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Bipartite-Splittance of a Bipartite Graph
Autorzy:
Yin, Jian-Hua
Guan, Jing-Xin
Powiązania:
https://bibliotekanauki.pl/articles/31343732.pdf
Data publikacji:
2019-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
degree sequence pair
bipartite-split graph
bipartite-splittance
Opis:
A bipartite-split graph is a bipartite graph whose vertex set can be partitioned into a complete bipartite set and an independent set. The bipartite- splittance of an arbitrary bipartite graph is the minimum number of edges to be added or removed in order to produce a bipartite-split graph. In this paper, we show that the bipartite-splittance of a bipartite graph depends only on the degree sequence pair of the bipartite graph, and an easily computable formula for it is derived. As a corollary, a simple characterization of the degree sequence pair of bipartite-split graphs is also given.
Źródło:
Discussiones Mathematicae Graph Theory; 2019, 39, 1; 23-29
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Note on the split domination number of the Cartesian product of paths
Autorzy:
Zwierzchowski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/744304.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
domination number
split domination number
Cartesian product of graphs
Opis:
In this note the split domination number of the Cartesian product of two paths is considered. Our results are related to [2] where the domination number of Pₘ ☐ Pₙ was studied. The split domination number of P₂ ☐ Pₙ is calculated, and we give good estimates for the split domination number of Pₘ ☐ Pₙ expressed in terms of its domination number.
Źródło:
Discussiones Mathematicae Graph Theory; 2005, 25, 1-2; 79-84
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Split Euler Tours In 4-Regular Planar Graphs
Autorzy:
Couch, PJ
Daniel, B.D.
Guidry, R.
Paul Wright, W.
Powiązania:
https://bibliotekanauki.pl/articles/31341188.pdf
Data publikacji:
2016-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
4-regular
3-connected
planar
split Euler tour
NP-complete
Opis:
The construction of a homing tour is known to be NP-complete. On the other hand, the Euler formula puts su cient restrictions on plane graphs that one should be able to assert the existence of such tours in some cases; in particular we focus on split Euler tours (SETs) in 3-connected, 4-regular, planar graphs (tfps). An Euler tour S in a graph G is a SET if there is a vertex v (called a half vertex of S) such that the longest portion of the tour between successive visits to v is exactly half the number of edges of G. Among other results, we establish that every tfp G having a SET S in which every vertex of G is a half vertex of S can be transformed to another tfp G′ having a SET S′ in which every vertex of G′ is a half vertex of S′ and G′ has at most one point having a face configuration of a particular class. The various results rely heavily on the structure of such graphs as determined by the Euler formula and on the construction of tfps from the octahedron. We also construct a 2-connected 4-regular planar graph that does not have a SET.
Źródło:
Discussiones Mathematicae Graph Theory; 2016, 36, 1; 23-30
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Displacement of Eigenvalues When Removing a Twin Vertex
Autorzy:
Briffa, Johann A.
Sciriha, Irene
Powiązania:
https://bibliotekanauki.pl/articles/31543314.pdf
Data publikacji:
2020-05-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
eigenvalues
perturbations
duplicate and co-duplicate vertices
threshold graph
nested split graph
Opis:
Twin vertices of a graph have the same open neighbourhood. If they are not adjacent, then they are called duplicates and contribute the eigenvalue zero to the adjacency matrix. Otherwise they are termed co-duplicates, when they contribute −1 as an eigenvalue of the adjacency matrix. On removing a twin vertex from a graph, the spectrum of the adjacency matrix does not only lose the eigenvalue 0 or −1. The perturbation sends a rippling effect to the spectrum. The simple eigenvalues are displaced. We obtain a closed formula for the characteristic polynomial of a graph with twin vertices in terms of two polynomials associated with the perturbed graph. These are used to obtain estimates of the displacements in the spectrum caused by the perturbation.
Źródło:
Discussiones Mathematicae Graph Theory; 2020, 40, 2; 435-450
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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