Sets of universal sequences for the symmetric group and analogous semigroups
Abstract
A universal sequence for a group or semigroup S is a sequence of words w1, w2,... such that for any sequence s1, s2,... ε S, the equations wn = sn, n ε ℕ, can be solved simultaneously in S. For example, Galvin showed that the sequence {a-1(anba-n)b-1(anb-1a-n)ba: n ε ℕ is universal for the symmetric group Sym(X) when X is infinite, and Sierpiński showed that (a2b3 (abab3)n+1 ab2 ab3)nεℕ is universal for the monoid XX of functions from the infinite set X to itself. In this paper, we show that under some conditions, the set of universal sequences for the symmetric group on an infinite set X is independent of the cardinality of X. More precisely, we show that if Y is any set such that |Y| ≥ |X|, then every universal sequence for Sym(X) is also universal for Sym(Y). If |X| > 2ℵ0, then the converse also holds. It is shown that an analogue of this theorem holds in the context of inverse semigroups, where the role of the symmetric group is played by the symmetric inverse monoid. In the general context of semigroups, the full transformation monoid XX is the natural analogue of the symmetric group and the symmetric inverse monoid. If X and Y are arbitrary infinite sets, then it is an open question as to whether or not every sequence that is universal for XX is also universal for YY. However, we obtain a sufficient condition for a sequence to be universal for XX which does not depend on the cardinality of X. A large class of sequences satisfy this condition, and hence are universal for XX for every infinite set X.
Citation
Hyde , J , Jonušas , J , Mitchell , J D & Péresse , Y H 2020 , ' Sets of universal sequences for the symmetric group and analogous semigroups ' , Proceedings of the American Mathematical Society , vol. 148 , no. 5 , pp. 1917-1931 . https://doi.org/10.1090/proc/14881
Publication
Proceedings of the American Mathematical Society
Status
Peer reviewed
ISSN
0002-9939Type
Journal article
Rights
Copyright © 2020 American Mathematical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1090/proc/14881
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