ISSN 1509-9415 (print version)

ISSN 2084-0373 (electronic version)

Discussiones Mathematicae - General Algebra and Applications

Cite Score: 0.4

SJR: 0.203

SNIP: 0.562

MCQ: 0.12

Index Copernicus: 120.64

Discussiones Mathematicae - General Algebra and Applications


Discussiones Mathematicae General Algebra and Applications 20(1) (2000) 97-120


Pedro V. Silva

Centro de Matemática, Faculdade de Ciencias, Universidade do Porto
4099-002 Porto, Portugal             e-mail:


The class of unique factorization semilattices (UFSs) contains important examples of semilattices such as free semilattices and the semilattices of idempotents of free inverse monoids. Their structural properties allow an efficient study, among other things, of their principal ideals. A general construction of UFSs from arbitrary posets is presented and some categorical properties are derived. The problem of embedding arbitrary semilattices into UFSs is considered and complete characterizations are obtained for particular classes of semilattices. The study of the Munn semigroup for regular UFSs is developed and a complete characterization is accomplished with respect to being E-unitary.

Keywords: semilattice, factorization, principal ideal, semilattice embedding, Munn semigroup.

1991 Mathematics Subject Classification: 6A12, 20M10, 20M18.


[1] J.M. Howie, An introduction to semigroup theory, Academic Press,London 1976.
[2] P.V. Silva, On the semilattice of idempotents of a free inverse monoid, Proc. Edinburgh Math. Soc. 36 (1993), 349-360.

Received 19 October 1998