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author:

Hu, F.-T. (Hu, F.-T..) [1] | Lin, Q. (Lin, Q..) [2] | Łuczak, T. (Łuczak, T..) [3] | Ning, B. (Ning, B..) [4] | Peng, X. (Peng, X..) [5]

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Abstract:

Let Bn be the book graph which consists of n copies of triangles all sharing a common edge. Let Cm be a cycle of length m. In 1978, Rousseau and Sheehan initiated the study of the book-cycle Ramsey number. A lot of effort has been made to determine the value of r(Bn,Cm) since then. In [Ars Combin., 31 (1991), pp. 239-248], Faudree, Rousseau, and Sheehan mentioned the following: "we know practically nothing about r(Bn,Cm) when m is even and greater than four. Also, the problem of computing r(Bn,Cm) when m is odd and m and n are nearly equal provides an unanswered test of strength."Answering the second part of the question above, the second and fifth authors recently obtained the value of r(Bn,Cm) for 8n 9 + 112 ≤ m ≤ ⌈ 3n 2 ⌉ + 1 and n being large. However, the value of r(Bn,Cm) is previously unknown for m≤ 8n 9 +111 and m being even as well as n+13 4 <m≤ 8n 9 +111 and m being odd. In this paper, for even m, we manage to determine the value of r(Bn,Cm) provided that m is linear with n and m is large enough. Thus this makes progress towards the first part of the question above. In addition, for odd m, we are able to obtain the value of r(Bn,Cm) for n 4 ≤ m≤ 9n 10 and m being large. © 2025 SIAM.

Keyword:

book cycle pancyclic Ramsey number

Community:

  • [ 1 ] [Hu F.-T.]Center for Pure Mathematics, School of Mathematical Sciences, Anhui University, Hefei, 230601, China
  • [ 2 ] [Lin Q.]Center for Discrete Mathematics, Fuzhou University, Fuzhou, 350108, China
  • [ 3 ] [Łuczak T.]Faculty of Mathematics and Computer Science, Adam Mickiewicz University, Poznan, Poland
  • [ 4 ] [Ning B.]College of Computer Science, Nankai University, Tianjin, 300350, China
  • [ 5 ] [Peng X.]Center for Pure Mathematics, School of Mathematical Sciences, Anhui University, Hefei, 230601, China

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Source :

SIAM Journal on Discrete Mathematics

ISSN: 0895-4801

Year: 2025

Issue: 1

Volume: 39

Page: 550-561

0 . 9 0 0

JCR@2023

CAS Journal Grade:2

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ESI Highly Cited Papers on the List: 0 Unfold All

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