Juhász, Zsófia and Vernitski, Alexei (2011) Using filters to describe congruences and band congruences of semigroups. Semigroup Forum, 83 (2). pp. 320-334. DOI https://doi.org/10.1007/s00233-011-9330-x
Juhász, Zsófia and Vernitski, Alexei (2011) Using filters to describe congruences and band congruences of semigroups. Semigroup Forum, 83 (2). pp. 320-334. DOI https://doi.org/10.1007/s00233-011-9330-x
Juhász, Zsófia and Vernitski, Alexei (2011) Using filters to describe congruences and band congruences of semigroups. Semigroup Forum, 83 (2). pp. 320-334. DOI https://doi.org/10.1007/s00233-011-9330-x
Abstract
It is well known that the smallest semilattice congruence can be described via filters. We generalise this result to the smallest left (right) normal band congruences and also to arbitrary semilattice (left normal band, right normal band) congruences, describing them all via filters. To achieve this, we introduce filters relative to arbitrary quasiorders on a semigroup (traditional filters are filters relative to the smallest negative operation-compatible quasiorder). We study congruences which can be described via filters. We show that the lattice of semilattice (left normal band, right normal band) congruences is a homomorphic image of the lattice of negative (right negative, left negative) operation-compatible quasiorders. © 2011 Springer Science+Business Media, LLC.
Item Type: | Article |
---|---|
Uncontrolled Keywords: | Filter; Semilattice; Band; Congruence; Quasiorder; Preorder |
Subjects: | Q Science > QA Mathematics |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Mathematics, Statistics and Actuarial Science, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 04 Jan 2012 11:32 |
Last Modified: | 30 Oct 2024 20:10 |
URI: | http://repository.essex.ac.uk/id/eprint/1808 |