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Перегляд Algebra and Discrete Mathematics, 2019, Vol. 28, № 1 за датою випуску

Репозиторій DSpace/Manakin

Перегляд Algebra and Discrete Mathematics, 2019, Vol. 28, № 1 за датою випуску

Сортувати за: Порядок: Результатів:

  • Some combinatorial characteristics of closure operations 
    Nguyen Hoang Son; Vu Duc Thi (Algebra and Discrete Mathematics, 2019)
    The aim of this paper investigates some combinatorial characteristics of minimal key and antikey of closure operations. We also give effective algorithms finding minimal keys and antikeys of closure operations. We estimate ...
  • Representations of strongly algebraically closed algebras 
    Molkhasi, A.; Shum, K.P. (Algebra and Discrete Mathematics, 2019)
    We introduce the notion of q′-compactness for MV-algebras. One of the main results of the paper is a characterization of a class of orthomodular lattices that are horizontal sums of strongly algebraically closed algebras.
  • Lie algebras of derivations with large abelian ideals 
    Klymenko, I.S.; Lysenko, S.V.; Petravchuk, A. (Algebra and Discrete Mathematics, 2019)
    We study subalgebras L of rank m over R of the Lie algebra Wn(K) with an abelian ideal I ⊂ L of the same rank m over R.
  • On the existence of degree-magic labellings of the n-fold self-union of complete bipartite graphs 
    Inpoonjai, P.; Jiarasuksakun, T. (Algebra and Discrete Mathematics, 2019)
    Magic rectangles are a classical generalization of the well-known magic squares, and they are related to graphs. A graph G is called degree-magic if there exists a labelling of the edges by integers 1, 2, . . . , |E(G)| ...
  • Additivity of elementary maps on alternative rings 
    Ferreira, B.L.M. (Algebra and Discrete Mathematics, 2019)
    Let ℜ and ℜ′ be alternative rings. In this article we investigate the additivity of surjective elementary maps of ℜ × ℜ′. As a main theorem, we prove that if ℜ idempotent satisfying some conditions, these maps are additive.
  • Cohen-Macaulay modules over the plane curve singularity of type T₄₄, II 
    Drozd, Y.A.; Tovpuha, O.V. (Algebra and Discrete Mathematics, 2019)
    We accomplish the classification of Cohen–Macaulay modules over the curve singularities of type T₄₄ and the description of the corresponding matrix factorizations, started in [8].
  • Geometry of flocks and n-ary groups 
    Dog, S. (Algebra and Discrete Mathematics, 2019)
    Semiabelinan flocks and n-ary groups are characterized by the properties of parallelograms and vectors of the affine geometry defined by these flocks and n-ary groups.
  • Paley-type graphs of order a product of two distinct primes 
    Das, A. (Algebra and Discrete Mathematics, 2019)
    In this paper, we initiate the study of Paley-type graphs ГN modulo N = pq, where p, q are distinct primes of the form 4k + 1. It is shown that ГN is an edge-regular, symmetric, Eulerian and Hamiltonian graph. Also, the ...
  • On the zero forcing number of graphs and their splitting graphs 
    Chacko, B.; Dominic, C.; Premodkumar, K.P. (Algebra and Discrete Mathematics, 2019)
    In [10], the notion of the splitting graph of a graph was introduced. In this paper we compute the zero forcing number of the splitting graph of a graph and also obtain some bounds besides finding the exact value of this ...
  • CI-property for the group (ℤp)² × ℤq × ℤr 
    Ali, E.; Hassoon, A. (Algebra and Discrete Mathematics, 2019)
    In this paper we prove that the group (ℤp)² × ℤq × ℤr is CI-group, where p, q, r are primes such that q and r divide p − 1, and r divides q − 1.
  • Exact sequences of graphs 
    Abbasi, A.; Ramin, A. (Algebra and Discrete Mathematics, 2019)
    In this paper, exact sequences of graphs are defined and investigated. Considering some functors on the category of graphs, we study some conditions to determine exactness of functors.

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