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author:

Li, Tianyu (Li, Tianyu.) [1] | Lin, Qizhong (Lin, Qizhong.) [2] (Scholars:林启忠) | Peng, Xing (Peng, Xing.) [3]

Indexed by:

EI Scopus SCIE

Abstract:

A book B-n is a graph which consists of n triangles sharing a common edge. In this paper, we study Ramsey numbers of quadrilateral versus books. Previous results give the exact value of r (C-4, B-n) for 1 <= n <= 14. We aim to determine the exact value of r (C-4, B-n) for infinitely many n. To achieve this, we first prove that r (C-4, B-(m -1)(2) +(t-2)) <= m(2) + t 2 for m >= 4 and 0 <= t <= m - 1. This improves upon a result by Faudree, Rousseau, and Sheehan which states that r (C-4, B-n) <= g (g (n)), where g (n) = n + left floor root n - 1 right floor + 2. Combining the new upper bound and constructions of C4-free graphs, we are able to determine the exact value of r (C4, Bn) for infinitely many n. As a special case, we show r (C-4, B-q(2) -q-2) = q(2) + q - 1 for all prime powers q >= 4.

Keyword:

book four-cycle Ramsey number

Community:

  • [ 1 ] [Li, Tianyu]Fuzhou Univ, Ctr Discrete Math, Dept Math, Fuzhou, Peoples R China
  • [ 2 ] [Lin, Qizhong]Fuzhou Univ, Ctr Discrete Math, Dept Math, Fuzhou, Peoples R China
  • [ 3 ] [Peng, Xing]Anhui Univ, Ctr Pure Math, Sch Math Sci, Dept Math, Hefei, Peoples R China
  • [ 4 ] [Lin, Qizhong]Fuzhou Univ, Ctr Discrete Math, Dept Math, Fuzhou 350108, Peoples R China

Reprint 's Address:

  • [Lin, Qizhong]Fuzhou Univ, Ctr Discrete Math, Dept Math, Fuzhou 350108, Peoples R China;;

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Source :

JOURNAL OF GRAPH THEORY

ISSN: 0364-9024

Year: 2022

Issue: 2

Volume: 103

Page: 309-322

0 . 9

JCR@2022

0 . 9 0 0

JCR@2023

ESI Discipline: MATHEMATICS;

ESI HC Threshold:24

JCR Journal Grade:2

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 1

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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