Перегляд за автором "Koppitz, J."

Сортувати за: Порядок: Результатів:

  • Endomorphisms of Clifford semigroups with injective structure homomorphisms 
    Worawiset, S.; Koppitz, J. (Algebra and Discrete Mathematics, 2020)
    In the present paper, we study semigroups of endomorphisms on Clifford semigroups with injective structure homomorphisms, where the semilattice has a least element. We describe such Clifford semigroups having a regular ...
  • On mappings of terms determined by hypersubstitutions 
    Koppitz, J.; Shtrakov, S. (Algebra and Discrete Mathematics, 2005)
    The extensions of hypersubstitutions are mappings on the set of all terms. In the present paper we characterize all hypersubstitutions which provide bijections on the set of all terms. The set of all such hypersubstitutions ...
  • Representations of ordered doppelsemigroups by binary relations 
    Zhuchok, Y.V.; Koppitz, J. (Algebra and Discrete Mathematics, 2019)
    We extend the study of doppelsemigroups and introduce the notion of an ordered doppelsemigroup. We construct the ordered doppelsemigroup of binary relations on an arbitrary set and prove that every ordered doppelsemigroup ...