Geodesic
On Closure Conditions
Canadian mathematical bulletin, Tome 19 (1976) no. 3, pp. 291-296

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

Quasigroups and groupoids with one or other of the Reidemeister or Thomsen closure conditions, the relationship among them with emphasis on their relationship to associativity viz groups, Abelian groups, have been investigated in [2], [3], [4], [5], [6], [12], and others. In [10] R- and T-groupoids, (that is, groupoids possessing one of the first two closure conditions mentioned above) which are generalizations of groups and Abelian groups were investigated. In this paper, we show that groupoids with the given identities may be described in terms of R- and T-groupoids. These results and others are used to give another proof of theorems given in [1], [7], and [5] describing the variety of all groups and Abelian groups defined by single laws. 
Kannappan, Pl.; Taylor, M. A. On Closure Conditions. Canadian mathematical bulletin, Tome 19 (1976) no. 3, pp. 291-296. doi: 10.4153/CMB-1976-045-6
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