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Wyszukujesz frazę "packing" wg kryterium: Temat


Tytuł:
Generalizations of the tree packing conjecture
Autorzy:
Gerbner, Dániel
Keszegh, Balázs
Palmer, Cory
Powiązania:
https://bibliotekanauki.pl/articles/743258.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
packing
tree packing
Opis:
The Gyárfás tree packing conjecture asserts that any set of trees with 2,3,...,k vertices has an (edge-disjoint) packing into the complete graph on k vertices. Gyárfás and Lehel proved that the conjecture holds in some special cases. We address the problem of packing trees into k-chromatic graphs. In particular, we prove that if all but three of the trees are stars then they have a packing into any k-chromatic graph. We also consider several other generalizations of the conjecture.
Źródło:
Discussiones Mathematicae Graph Theory; 2012, 32, 3; 569-582
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Packing Parameters in Graphs
Autorzy:
Sahul Hamid, I.
Saravanakumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/31232984.pdf
Data publikacji:
2015-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
packing number
open packing number
Opis:
In a graph $G = (V,E)$, a non-empty set $S ⊆ V$ is said to be an open packing set if no two vertices of $S$ have a common neighbour in $G$. An open packing set which is not a proper subset of any open packing set is called a maximal open packing set. The minimum and maximum cardinalities of a maximal open packing set are respectively called the lower open packing number and the open packing number and are denoted by $ρ^L_o$ and $ρ^o$. In this paper, we present some bounds on these parameters.
Źródło:
Discussiones Mathematicae Graph Theory; 2015, 35, 1; 5-16
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Labeled Embedding Of (n, n-2)-Graphs In Their Complements
Autorzy:
Tahraoui, M.-A.
Duchêne, E.
Kheddouci, H.
Powiązania:
https://bibliotekanauki.pl/articles/31341583.pdf
Data publikacji:
2017-11-27
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
packing of graphs
labeled packing
permutation
Opis:
Graph packing generally deals with unlabeled graphs. In [4], the authors have introduced a new variant of the graph packing problem, called the labeled packing of a graph. This problem has recently been studied on trees [M.A. Tahraoui, E. Duchêne and H. Kheddouci, Labeled 2-packings of trees, Discrete Math. 338 (2015) 816-824] and cycles [E. Duchˆene, H. Kheddouci, R.J. Nowakowski and M.A. Tahraoui, Labeled packing of graphs, Australas. J. Combin. 57 (2013) 109-126]. In this note, we present a lower bound on the labeled packing number of any (n, n − 2)-graph into Kn. This result improves the bound given by Woźniak in [Embedding graphs of small size, Discrete Appl. Math. 51 (1994) 233-241].
Źródło:
Discussiones Mathematicae Graph Theory; 2017, 37, 4; 1015-1025
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Labeled Packing of Cycles and Circuits
Autorzy:
Joffard, Alice
Kheddouci, Hamamache
Powiązania:
https://bibliotekanauki.pl/articles/32361725.pdf
Data publikacji:
2022-05-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
packing of graphs
labeled packing
cycles
circuits
Opis:
In 2013, Duchçne, Kheddouci, Nowakowski and Tahraoui introduced a labeled version of the graph packing problem. It led to the introduction of a new graph parameter, the k-packing label-span λk. This parameter corresponds, given a graph H on n vertices, to the maximum number of labels we can assign to the vertices of the graph, such that there exists a packing of k copies of H into the complete graph Kn, coherent with the labels of the vertices. The authors intensively studied the labeled packing of cycles, and, among other results, they conjectured that for every cycle Cn of order n = 2k + x, with k ≥ 2 and 1 ≤ x ≤ 2k − 1, the value of λk(Cn) was 2 if x is 1 and k is even, and x + 2 otherwise. In this paper, we disprove this conjecture by giving a counterexample. We however prove that it gives a valid lower bound, and we give sufficient conditions for the upper bound to hold. We then give some similar results for the labeled packing of circuits.
Źródło:
Discussiones Mathematicae Graph Theory; 2022, 42, 2; 443-469
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Packing Trees Into n-Chromatic Graphs
Autorzy:
Gyárfás, András
Powiązania:
https://bibliotekanauki.pl/articles/30147222.pdf
Data publikacji:
2014-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
tree packing
Opis:
We show that if a sequence of trees T1, T2, ..., Tn−1 can be packed into Kn then they can be also packed into any n-chromatic graph.
Źródło:
Discussiones Mathematicae Graph Theory; 2014, 34, 1; 199-201
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on packing of two copies of a hypergraph
Autorzy:
Pilśniak, Monika
Woźniak, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/743647.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
packing
hypergraphs
Opis:
A 2-packing of a hypergraph is a permutation σ on V() such that if an edge e belongs to (), then σ (e) does not belong to ().
We prove that a hypergraph which does not contain neither empty edge ∅ nor complete edge V() and has at most 1/2n edges is 2-packable.
A 1-uniform hypergraph of order n with more than 1/2n edges shows that this result cannot be improved by increasing the size of .
Źródło:
Discussiones Mathematicae Graph Theory; 2007, 27, 1; 45-49
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Note on Packing of Uniform Hypergraphs
Autorzy:
Konarski, Jerzy
Woźniak, Mariusz
Żak, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/32222532.pdf
Data publikacji:
2022-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
packing
hypergraphs
Opis:
We say that two n-vertex hypergraphs H1 and H2 pack if they can be found as edge-disjoint subhypergraphs of the complete hypergraph Kn. Whilst the problem of packing of graphs (i.e., 2-uniform hypergraphs) has been studied extensively since seventies, much less is known about packing of k-uniform hypergraphs for k ≥ 3. Naroski [Packing of nonuniform hypergraphs - product and sum of sizes conditions, Discuss. Math. Graph Theory 29 (2009) 651–656] defined the parameter mk(n) to be the smallest number m such that there exist two n-vertex k-uniform hypergraphs with total number of edges equal to m which do not pack, and conjectured that mk(n) = Θ (nk−1). In this note we show that this conjecture is far from being truth. Namely, we prove that the growth rate of mk(n) is of order nk/2 exactly for even k’s and asymptotically for odd k’s.
Źródło:
Discussiones Mathematicae Graph Theory; 2022, 42, 4; 1383-1388
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Survey on Packing Colorings
Autorzy:
Brešar, Boštjan
Ferme, Jasmina
Klavžar, Sandi
Rall, Douglas F.
Powiązania:
https://bibliotekanauki.pl/articles/31804166.pdf
Data publikacji:
2020-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
packing coloring
packing chromatic number
subcubic graph
S -packing chromatic number
computational complexity
Opis:
If S = (a1, a2, . . .) is a non-decreasing sequence of positive integers, then an S-packing coloring of a graph G is a partition of V (G) into sets X1, X2, . . . such that for each pair of distinct vertices in the set Xi, the distance between them is larger than ai. If there exists an integer k such that V (G) = X1 ∪ ∪ Xk, then the partition is called an S-packing k-coloring. The S-packing chromatic number of G is the smallest k such that G admits an S-packing k-coloring. If ai = i for every i, then the terminology reduces to packing colorings and packing chromatic number. Since the introduction of these generalizations of the chromatic number in 2008 more than fifty papers followed. Here we survey the state of the art on the packing coloring, and its generalization, the S-packing coloring. We also list several conjectures and open problems.
Źródło:
Discussiones Mathematicae Graph Theory; 2020, 40, 4; 923-970
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Packing Coloring of Some Undirected and Oriented Coronae Graphs
Autorzy:
Laïche, Daouya
Bouchemakh, Isma
Sopena, Éric
Powiązania:
https://bibliotekanauki.pl/articles/31341695.pdf
Data publikacji:
2017-08-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
packing coloring
packing chromatic number
corona graph
path
cycle
Opis:
The packing chromatic number χρ(G) of a graph G is the smallest integer k such that its set of vertices V(G) can be partitioned into k disjoint subsets V1, . . ., Vk, in such a way that every two distinct vertices in Vi are at distance greater than i in G for every i, 1 ≤ i ≤ k. For a given integer p ≥ 1, the p-corona of a graph G is the graph obtained from G by adding p degree-one neighbors to every vertex of G. In this paper, we determine the packing chromatic number of p-coronae of paths and cycles for every p ≥ 1. Moreover, by considering digraphs and the (weak) directed distance between vertices, we get a natural extension of the notion of packing coloring to digraphs. We then determine the packing chromatic number of orientations of p-coronae of paths and cycles.
Źródło:
Discussiones Mathematicae Graph Theory; 2017, 37, 3; 665-690
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Packing the Hypercube
Autorzy:
Offner, David
Powiązania:
https://bibliotekanauki.pl/articles/30147221.pdf
Data publikacji:
2014-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
hypercube
packing
decomposition
Opis:
Let G be a graph that is a subgraph of some n-dimensional hypercube Qn. For sufficiently large n, Stout [20] proved that it is possible to pack vertex-disjoint copies of G in Qn so that any proportion r < 1 of the vertices of Qn are covered by the packing. We prove an analogous theorem for edge-disjoint packings: For sufficiently large n, it is possible to pack edge-disjoint copies of G in Qn so that any proportion r < 1 of the edges of Qn are covered by the packing.
Źródło:
Discussiones Mathematicae Graph Theory; 2014, 34, 1; 85-93
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on uniquely embeddable graphs
Autorzy:
Woźniak, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/972053.pdf
Data publikacji:
1998
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
packing of graphs
Opis:
Let G be a simple graph of order n and size e(G). It is well known that if e(G) ≤ n-2, then there is an embedding G into its complement [G̅]. In this note, we consider a problem concerning the uniqueness of such an embedding.
Źródło:
Discussiones Mathematicae Graph Theory; 1998, 18, 1; 15-21
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Toward Wojdas conjecture on digraph packing
Autorzy:
Konarski, J.
Żak, A.
Powiązania:
https://bibliotekanauki.pl/articles/255123.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
packing
digraph
size
Opis:
Given a positive integer m ≤ n/2, Wojda conjectured in 1985 that if D1 and D2 are digraphs of order n such that [formula] and [formula] then D1 and D2 pack. The cases when m = 1 or m = n/2 follow from known results. Here we prove the conjecture for [formula].
Źródło:
Opuscula Mathematica; 2017, 37, 4; 589-595
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Packing of nonuniform hypergraphs - product and sum of sizes conditions
Autorzy:
Naroski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/744492.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
nonuniform hypergraph
packing
Opis:
Hypergraphs $H₁,...,H_N$ of order n are mutually packable if one can find their edge disjoint copies in the complete hypergraph of order n. We prove that two hypergraphs are mutually packable if the product of their sizes satisfies some upper bound. Moreover we show that an arbitrary set of the hypergraphs is mutually packable if the sum of their sizes is sufficiently small.
Źródło:
Discussiones Mathematicae Graph Theory; 2009, 29, 3; 651-656
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Average case analysis of the set packing problem
Autorzy:
Szkatuła, K.
Powiązania:
https://bibliotekanauki.pl/articles/206822.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Lagrange
set packing problem
Opis:
The paper deals with the well known set packing problem and its special case, when the number of subsets is maximized. It is assumed that some of the problem coefficients are realizations of mutually independent random variables. Average case (i.e. asymptotical probabilistic) properties of selected problem characteristics are investigated for the variety of possible instances of the problem.
Źródło:
Control and Cybernetics; 2014, 43, 4; 557-575
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł

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