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MAXIMAL SUBSEMIGROUPS OF INFINITE SYMMETRIC GROUPS

Published online by Cambridge University Press:  29 January 2024

SUZANA MENDES-GONÇALVES*
Affiliation:
Centro de Matemática, Universidade do Minho, 4710 Braga, Portugal
R. P. SULLIVAN
Affiliation:
School of Mathematics and Statistics, University of Western Australia, Nedlands, Western Australia 6009, Australia e-mail: bob@maths.uwa.edu.au

Abstract

Brazil et al. [‘Maximal subgroups of infinite symmetric groups’, Proc. Lond. Math. Soc. (3) 68(1) (1994), 77–111] provided a new family of maximal subgroups of the symmetric group $G(X)$ defined on an infinite set X. It is easy to see that, in this case, $G(X)$ contains subsemigroups that are not groups, but nothing is known about nongroup maximal subsemigroups of $G(X)$. We provide infinitely many examples of such semigroups.

Type
Research Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of Australian Mathematical Publishing Association Inc.

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Footnotes

To the memory of Eckehart Hotzel, with respect and gratitude

Research by the first author was partially financed by Portuguese Funds through FCT (Fundação para a Ciência e a Tecnologia) within the Projects UIDB/00013/2020 and UIDP/00013/2020.

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