Results 51 to 60 of about 21,406 (168)

Anti-Ramsey Number of Hanoi Graphs

open access: yesDiscussiones Mathematicae Graph Theory, 2019
Let ar(G,H) be the largest number of colors such that there exists an edge coloring of G with ar(G,H) colors such that each subgraph isomorphic to H has at least two edges in the same color. We call ar(G,H) the anti- Ramsey number for a pair of graphs (G,
Gorgol Izolda, Lechowska Anna
doaj   +1 more source

On Regressive Ramsey Numbers

open access: yesJournal of Combinatorial Theory, Series A, 2002
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Ramsey numbers for matchings

open access: yesDiscrete Mathematics, 1980
AbstractWe consider the Ramsey number r(sK2, G) where sK2(s⩾1) denotes a set of s disjoint edges and G is an arbitrary finite simple graph with no isolated vertices. We obtain upper and lower bounds in the general case. Exact results are obtained for certain classes of graphs.
Ralph J. Faudree   +2 more
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Connected size Ramsey numbers of matchings versus a small path or cycle

open access: yesElectronic Journal of Graph Theory and Applications
Given two graphs G1, G2, the connected size Ramsey number rc(G1, G2) is defined to be the minimum number of edges of a connected graph G, such that for any red-blue edge colouring of G, there is either a red copy of G1 or a blue copy of G2. Concentrating
Sha Wang   +3 more
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On the Restricted Size Ramsey Number Involving a Path P3

open access: yesDiscussiones Mathematicae Graph Theory, 2019
For any pair of graphs G and H, both the size Ramsey number ̂r(G,H) and the restricted size Ramsey number r*(G,H) are bounded above by the size of the complete graph with order equals to the Ramsey number r(G,H), and bounded below by e(G) + e(H) − 1 ...
Silaban Denny Riama   +2 more
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On weighted Ramsey numbers [PDF]

open access: yesAustralas. J Comb., 2007
15 ...
Maria Axenovich, Ryan R. Martin
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Singular Ramsey and Turán numbers

open access: yesTheory and Applications of Graphs, 2019
We say that a subgraph F of a graph G is singular if the degrees d_G(v) are all equal or all distinct for the vertices v of F. The singular Ramsey number Rs(F) is the smallest positive integer n such that, for every m at least n, in every edge 2-coloring
Yair Caro, Zsolt Tuza
doaj   +1 more source

On Ramsey numbers of fans

open access: yesDiscrete Applied Mathematics, 2009
The graph \(F_n = K_1 + nK_2\) is the Fan graph, and consists of \(n\) triangles sharing a single vertex. It was shown in [\textit{Y. Li} and \textit{C.C. Rousseau}, J. Graph Theory 23, No.\,4, 413--420 (1996; Zbl 0954.05031)] that the Ramsey number \(r(F_1, F_n) = 4n + 1\) for \(n \geq 2\), and this result is extended by showing that \(r(F_2, F_n ...
Qizhong Lin, Yusheng Li 0001
openaire   +1 more source

Gallai-Ramsey number of an 8-cycle

open access: yesAKCE International Journal of Graphs and Combinatorics, 2020
Given graphs G and H and a positive integer k, the Gallai-Ramsey number is the minimum integer N such that for any integer every k-edge-coloring of Kn contains either a rainbow copy of G or a monochromatic copy of H.
Jonathan Gregory   +2 more
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Chromatic Ramsey numbers

open access: yesDiscrete Mathematics, 1998
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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