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Congruences on infinite partition and partial Brauer monoids
James Easta, Nik Ruškucb a Centre for Research in Mathematics, School of Computing, Engineering and Mathematics, Western Sydney University, Locked Bag 1797, Penrith NSW 2751, Australia
b Mathematical Institute, School of Mathematics and Statistics, University of St Andrews, St Andrews, Fife KY16 9SS, UK
Abstract:
We give a complete description of the congruences on the partition monoid $\mathcal{P}_X$ and the partial Brauer monoid $\mathcal{PB}_X$, where $X$ is an arbitrary infinite set, and also of the lattices formed by all such congruences. Our results complement those from a recent article of East, Mitchell, Ruškuc and Torpey, which deals with the finite case. As a consequence of our classification result, we show that the congruence lattices of $\mathcal{P}_X$ and $\mathcal{PB}_X$ are isomorphic to each other, and are distributive and well quasi-ordered. We also calculate the smallest number of pairs of partitions required to generate any congruence; when this number is infinite, it depends on the cofinality of certain limit cardinals.
Key words and phrases:
diagram monoids, partition monoids, partial Brauer monoids, congruences, well quasi-orderedness.
Citation:
James East, Nik Ruškuc, “Congruences on infinite partition and partial Brauer monoids”, Mosc. Math. J., 22:2 (2022), 295–372
Linking options:
https://www.mathnet.ru/eng/mmj829 https://www.mathnet.ru/eng/mmj/v22/i2/p295
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Abstract page: | 13 | References: | 9 |
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