Geodesic
Complete and Orthogonally Complete Rings
Canadian journal of mathematics, Tome 27 (1975) no. 4, pp. 884-892

Voir la notice de l'article provenant de la source Cambridge University Press

This article continues the study of Abian's order on commutative semiprime rings (for such a ring R, the relation a ≦ b if and only if ab = a2” makes R into a partially ordered multiplicative semigroup). The aim, here, is to extend as far as possible the theorem of Brainerd and Lambek which says that the completion of a Boolean ring is its complete ring of quotients. Only certain subsets of a ring may have upper bounds (in any extension ring) and these are called boundable (the notion is due to Haines). A ring will be called complete if every boundable subset has a supremum. If R ⊂ S are (commutative semiprime) rings then S will be called a completion of R if S is complete and every element of S is the supremum of a subset of R. 
Burgess, W. D.; Raphael, R. Complete and Orthogonally Complete Rings. Canadian journal of mathematics, Tome 27 (1975) no. 4, pp. 884-892. doi: 10.4153/CJM-1975-095-0
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