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PARTITION OF LARGE SUBSETS OF SEMIGROUPS

Published online by Cambridge University Press:  03 January 2024

TENG ZHANG*
Affiliation:
SCHOOL OF SCIENCE ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY LIUHE ROAD HANGZHOU 310023 ZHEJIANG, CHINA

Abstract

It is known that in an infinite very weakly cancellative semigroup with size $\kappa $, any central set can be partitioned into $\kappa $ central sets. Furthermore, if $\kappa $ contains $\lambda $ almost disjoint sets, then any central set contains $\lambda $ almost disjoint central sets. Similar results hold for thick sets, very thick sets and piecewise syndetic sets. In this article, we investigate three other notions of largeness: quasi-central sets, C-sets, and J-sets. We obtain that the statement applies for quasi-central sets. If the semigroup is commutative, then the statement holds for C-sets. Moreover, if $\kappa ^\omega = \kappa $, then the statement holds for J-sets.

Type
Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Association for Symbolic Logic

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References

REFERENCES

Carlson, T. J., Hindman, N., McLeod, J., and Strauss, D., Almost disjoint large subsets of semigroups . Topology and its Applications, vol. 155 (2008), pp. 433444.Google Scholar
Hindman, N., Maleki, A., and Strauss, D., Central sets and their combinatorial characterization . Journal of Combinatorial Theory, Series A, vol. 74 (1996), no. 2, pp. 188208.Google Scholar
Hindman, N. and Strauss, D., Algebra in the Stone–Čech Compactification: Theory and Applications, second ed., de Gruyter, Berlin, 2012.Google Scholar