Principal ideals in the semigroup of binary relations on a finite set: What happens when one element is added to the set.
Breen, M.
Semigroup forum, Tome 44 (1992), p. 129-132 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1992-01-01
EUDML-ID : urn:eudml:doc:135137 
@article{GDZPPN001261517,
     title = {Principal ideals in the semigroup of binary relations  on a finite set: What happens when one element is added to the set.},
     journal = {Semigroup forum},
     volume = {44},
     year = {1992},
     pages = {129-132},
     zbl = {0763.20023},
     url = {http://dml.mathdoc.fr/item/GDZPPN001261517}
}

Breen, M. Principal ideals in the semigroup of binary relations  on a finite set: What happens when one element is added to the set.. Semigroup forum, Tome 44 (1992) pp. 129-132. http://gdmltest.u-ga.fr/item/GDZPPN001261517/