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On the computation of union-extensions of finite semigroups
1973
Acta Cybernetica
Preserved Fulltext
In his dissertation of 1968 [3] Verbeek proposed a generalization of the theory of semigroup extensions, which until that date consisted of the two nearly disjoint parts of Schreier-and ideal-extensions. According to Verbeek we define a semigroup extension as follows:
dblp:journals/actaC/BrockJ76
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