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Wyświetlanie 1-5 z 5
Tytuł:
Interval Incidence Coloring of Subcubic Graphs
Autorzy:
Małafiejska, Anna
Małafiejski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/31341833.pdf
Data publikacji:
2017-05-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
interval incidence coloring
incidence coloring
subcubic graph
Opis:
In this paper we study the problem of interval incidence coloring of subcubic graphs. In [14] the authors proved that the interval incidence 4-coloring problem is polynomially solvable and the interval incidence 5-coloring problem is NP-complete, and they asked if Xii(G) ≤ 2Δ(G) holds for an arbitrary graph G. In this paper, we prove that an interval incidence 6-coloring always exists for any subcubic graph G with Δ(G) = 3.
Źródło:
Discussiones Mathematicae Graph Theory; 2017, 37, 2; 427-441
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incidence Coloring—Cold Cases
Autorzy:
Kardoš, František
Maceková, Mária
Mockovčiaková, Martina
Sopena, Éric
Soták, Roman
Powiązania:
https://bibliotekanauki.pl/articles/32083735.pdf
Data publikacji:
2020-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
incidence coloring
incidence chromatic number
planar graph
maximum average degree
Opis:
An incidence in a graph G is a pair (v, e) where v is a vertex of G and e is an edge of G incident to v. Two incidences (v, e) and (u, f) are adjacent if at least one of the following holds: (i) v = u, (ii) e = f, or (iii) edge vu is from the set {e, f}. An incidence coloring of G is a coloring of its incidences assigning distinct colors to adjacent incidences. The minimum number of colors needed for incidence coloring of a graph is called the incidence chromatic number. It was proved that at most Δ(G) + 5 colors are enough for an incidence coloring of any planar graph G except for Δ(G) = 6, in which case at most 12 colors are needed. It is also known that every planar graph G with girth at least 6 and Δ(G) ≥ 5 has incidence chromatic number at most Δ(G) + 2. In this paper we present some results on graphs regarding their maximum degree and maximum average degree. We improve the bound for planar graphs with Δ(G) = 6. We show that the incidence chromatic number is at most Δ(G) + 2 for any graph G with mad(G) < 3 and Δ(G) = 4, and for any graph with mad(G)<103 and Δ(G) ≥ 8.
Źródło:
Discussiones Mathematicae Graph Theory; 2020, 40, 1; 345-354
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On incidence coloring of graph fractional powers
Autorzy:
Mozafari-Nia, Mahsa
Iradmusa, Moharram N.
Powiązania:
https://bibliotekanauki.pl/articles/29519190.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
incidence coloring
incidence chromatic number
subdivision of graph
power of graph
Opis:
For any $ n ∈ \mathbb{N} $, the n-subdivision of a graph $ G $ is a simple graph $ G^\frac{1}{n} $ which is constructed by replacing each edge of $ G $ with a path of length n. The m-th power of $ G $ is a graph, denoted by $ G^m $, with the same vertices of $ G $, where two vertices of $ G^m $ are adjacent if and only if their distance in $ G $ is at most m. In [M.N. Iradmusa, On colorings of graph fractional powers, Discrete Math. 310 (2010), no. 10-11, 1551-1556] the m-th power of the n-subdivision of $ G $, denoted by $ G^\frac{m}{n} $ is introduced as a fractional power of $ G $. The incidence chromatic number of $ G $, denoted by $ χ_i(G) $, is the minimum integer k such that $ G $ has an incidence k-coloring. In this paper, we investigate the incidence chromatic number of some fractional powers of graphs and prove the correctness of the incidence coloring conjecture for some powers of graphs.
Źródło:
Opuscula Mathematica; 2023, 43, 1; 109-123
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Incidence Chromatic Number of Toroidal Grids
Autorzy:
Sopena, Éric
Wu, Jiaojiao
Powiązania:
https://bibliotekanauki.pl/articles/30146633.pdf
Data publikacji:
2013-05-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
incidence coloring
Cartesian product of cycles
toroidal grid
Opis:
An incidence in a graph $G$ is a pair $(v, e)$ with $v \in V (G)$ and $e \in E(G)$, such that $v$ and $e$ are incident. Two incidences $(v, e)$ and $(w, f)$ are adjacent if $v = w$, or $e = f$, or the edge $vw$ equals $e$ or $f$. The incidence chromatic number of $G$ is the smallest $k$ for which there exists a mapping from the set of incidences of $G$ to a set of $k$ colors that assigns distinct colors to adjacent incidences. In this paper, we prove that the incidence chromatic number of the toroidal grid $T_{m,n} = C_m \square C_n$ equals 5 when $ m, n \equiv 0( \mod 5) $ and 6 otherwise.
Źródło:
Discussiones Mathematicae Graph Theory; 2013, 33, 2; 315-327
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Incidence Coloring of Complete Multipartite and Semicubic Bipartite Graphs
Autorzy:
Janczewski, Robert
Małafiejski, Michał
Małafiejska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/31342434.pdf
Data publikacji:
2018-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
incidence coloring
complete multipartite graphs
semicubic graphs
subcubic graphs
-completeness
L (1,1)-labelling
Opis:
In the paper, we show that the incidence chromatic number $ \chi_i $ of a complete $k$-partite graph is at most $ \Delta + 2 $ (i.e., proving the incidence coloring conjecture for these graphs) and it is equal to $ \Delta + 1 $ if and only if the smallest part has only one vertex (i.e., $ \Delta = n − 1 $). Formally, for a complete k-partite graph $ G = K_{r_1,r_2,...,r_k} $ with the size of the smallest part equal to $ r_1 \ge 1 $ we have $$ \chi_i (G)= \begin{cases} \Delta(G)+1 & \text { if } r_1=1, \\ \Delta(G)+2 & \text { if } r_1>1. \end{cases} $$ In the paper we prove that the incidence 4-coloring problem for semicubic bipartite graphs is \( \mathcal{NP} \)-complete, thus we prove also the \( \mathcal{NP} \)-completeness of L(1, 1)-labeling problem for semicubic bipartite graphs. Moreover, we observe that the incidence 4-coloring problem is \( \mathcal{NP} \)-complete for cubic graphs, which was proved in the paper [12] (in terms of generalized dominating sets).
Źródło:
Discussiones Mathematicae Graph Theory; 2018, 38, 1; 107-119
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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