# On path-quasar Ramsey numbers

• Volume: 68, Issue: 2, page 11-17
• ISSN: 2083-7402

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## Abstract

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Let G1 and G2 be two given graphs. The Ramsey number R(G1,G2) is the least integer r such that for every graph G on r vertices, either G contains a G1 or Ḡ contains a G2. Parsons gave a recursive formula to determine the values of R(Pn,K1,m), where Pn is a path on n vertices and K1,m is a star on m+1 vertices. In this note, we study the Ramsey numbers R(Pn,K1,m), where Pn is a linear forest on m vertices. We determine the exact values of R(Pn,K1∨Fm) for the cases m ≤ n and m ≥ 2n, and for the case that Fm has no odd component. Moreover, we give a lower bound and an upper bound for the case n+1 ≤ m ≤ 2n−1 and Fm has at least one odd component.

## How to cite

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Binlong Li, and Bo Ning. "On path-quasar Ramsey numbers." Annales UMCS, Mathematica 68.2 (2015): 11-17. <http://eudml.org/doc/270004>.

@article{BinlongLi2015,
abstract = {Let G1 and G2 be two given graphs. The Ramsey number R(G1,G2) is the least integer r such that for every graph G on r vertices, either G contains a G1 or Ḡ contains a G2. Parsons gave a recursive formula to determine the values of R(Pn,K1,m), where Pn is a path on n vertices and K1,m is a star on m+1 vertices. In this note, we study the Ramsey numbers R(Pn,K1,m), where Pn is a linear forest on m vertices. We determine the exact values of R(Pn,K1∨Fm) for the cases m ≤ n and m ≥ 2n, and for the case that Fm has no odd component. Moreover, we give a lower bound and an upper bound for the case n+1 ≤ m ≤ 2n−1 and Fm has at least one odd component.},
author = {Binlong Li, Bo Ning},
journal = {Annales UMCS, Mathematica},
keywords = {Ramsey number; path; star; quasar},
language = {eng},
number = {2},
pages = {11-17},
title = {On path-quasar Ramsey numbers},
url = {http://eudml.org/doc/270004},
volume = {68},
year = {2015},
}

TY - JOUR
AU - Binlong Li
AU - Bo Ning
TI - On path-quasar Ramsey numbers
JO - Annales UMCS, Mathematica
PY - 2015
VL - 68
IS - 2
SP - 11
EP - 17
AB - Let G1 and G2 be two given graphs. The Ramsey number R(G1,G2) is the least integer r such that for every graph G on r vertices, either G contains a G1 or Ḡ contains a G2. Parsons gave a recursive formula to determine the values of R(Pn,K1,m), where Pn is a path on n vertices and K1,m is a star on m+1 vertices. In this note, we study the Ramsey numbers R(Pn,K1,m), where Pn is a linear forest on m vertices. We determine the exact values of R(Pn,K1∨Fm) for the cases m ≤ n and m ≥ 2n, and for the case that Fm has no odd component. Moreover, we give a lower bound and an upper bound for the case n+1 ≤ m ≤ 2n−1 and Fm has at least one odd component.
LA - eng
KW - Ramsey number; path; star; quasar
UR - http://eudml.org/doc/270004
ER -

## References

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1. [1] Bondy, J. A., Murty, U. S. R., Graph Theory with Applications, American Elsevier Publishing Co., Inc., New York, 1976. Zbl1226.05083
2. [2] Chen, Y., Zhang, Y., Zhang, K., The Ramsey numbers of paths versus wheels, Discrete Math. 290 (1) (2005), 85-87.[WoS] Zbl1059.05074
3. [3] Dirac, G. A., Some theorems on abstract graphs, Proc. London. Math. Soc. 2 (1952), 69-81. Zbl0047.17001
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5. [5] Graham, R. L., Rothschild, B. L., Spencer, J. H., Ramsey Theory, Second Edition, John Wiley & Sons Inc., New York, 1990.
6. [6] Li, B., Ning, B., The Ramsey numbers of paths versus wheels: a complete solution, Electron. J. Combin. 21 (4) (2014), #P4.41. Zbl1305.05140
7. [7] Parsons, T. D., Path-star Ramsey numbers, J. Combin. Theory, Ser. B 17 (1) (1974), 51-58. Zbl0282.05110
8. [8] Rousseau, C. C., Sheehan, J., A class of Ramsey problems involving trees, J. London Math. Soc. 2 (3) (1978), 392-396.[Crossref] Zbl0393.05037
9. [9] Salman, A. N. M., Broersma, H. J., Path-fan Ramsey numbers, Discrete Applied Math. 154 (9) (2006), 1429-1436. Zbl1093.05043
10. [10] Salman, A. N. M., Broersma, H. J., Path-kipas Ramsey numbers, Discrete Applied Math. 155 (14) (2007), 1878-1884.[WoS] Zbl1128.05037
11. [11] Zhang, Y., On Ramsey numbers of short paths versus large wheels, Ars Combin. 89 (2008), 11-20. Zbl1224.05346

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