2015
DOI: 10.1016/j.disc.2015.04.018
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Decompositions of triangle-free 5-regular graphs into paths of length five

Abstract: a b s t r a c tA P k -decomposition of a graph G is a set of edge-disjoint paths with k edges that cover the edge set of G. Kotzig (1957) proved that a 3-regular graph admits a P 3 -decomposition if and only if it contains a perfect matching. Kotzig also asked what are the necessary and sufficient conditions for a (2k + 1)-regular graph to admit a decomposition into paths with 2k + 1 edges. We partially answer this question for the case k = 2 by proving that the existence of a perfect matching is sufficient fo… Show more

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Cited by 17 publications
(25 citation statements)
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References 18 publications
(17 reference statements)
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“…A closely related problem to the conjecture of Gallai that has drew great interest [2,7,9,12,13] is as follows: given a family of paths H, is there a decomposition D of G such that each graph in D is isomorphic to a graph in H? We give a step forward towards obtaining constrained path decompositions of even regular graphs.…”
Section: Introductionmentioning
confidence: 99%
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“…A closely related problem to the conjecture of Gallai that has drew great interest [2,7,9,12,13] is as follows: given a family of paths H, is there a decomposition D of G such that each graph in D is isomorphic to a graph in H? We give a step forward towards obtaining constrained path decompositions of even regular graphs.…”
Section: Introductionmentioning
confidence: 99%
“…Theorem 3 (Botler et al [1,2]). Let k ≥ 3 and G be a 2k − 1-regular graph of girth at least 2k − 2 that admits a perfect matching.…”
Section: Introductionmentioning
confidence: 99%
“…Para isso, eles constroem uma decomposição do grafo em trilhas com 3 arestas, i.e, 3-caminhos e triângulos, e depois mostram que se nessa decomposição existe algum triângulo X, então existe um outro elemento Y tal que X ∪ Y pode ser decomposto em dois caminhos de comprimento 3. Em [BMW15], decompomos um grafo 5-regular, que contém um emparelhamento perfeito e é livre de triângulos, em trilhas de comprimento 5 que podem conter um C 4 (veja Figura 3.1). Depois mostramos que se trocarmos arestas entre os elementos dessa decomposição numa determinada ordem, obtemos uma decomposição em 5-caminhos.…”
Section: Um Lema De Desemaranhamentounclassified
“…Os dois resultados seguintes constituem casos especiais dos teoremas que provaremos a seguir. Para o caso m = 1, generalizamos o resultado em [BMW15], que afirma que todo grafo 5-regular livre de triângulos e que contém um emparelhamento perfeito admite uma P 5 -decomposição.…”
Section: Decomposições De Grafos Regularesunclassified
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