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Перегляд Algebra and Discrete Mathematics, 2020, Vol. 30, № 2 за датою випуску

Репозиторій DSpace/Manakin

Перегляд Algebra and Discrete Mathematics, 2020, Vol. 30, № 2 за датою випуску

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 a product of two formational tcc-subgroups 
    Trofimuk, A. (Algebra and Discrete Mathematics, 2020)
    A subgroup A of a group G is called tcc-subgroup in G, if there is a subgroup T of G such that G = AT and for any X ≤ A and Y ≤ T there exists an element u ∈ hX, Y i such that XYᵘ ≤ G. The notation H ≤ G means that H is ...
  • Geometrical equivalence and action type geometrical equivalence of group representations 
    Simoes da Silva, J.; Tsurkov, A. (Algebra and Discrete Mathematics, 2020)
    In this paper we construct an example of two representations (V₁,G₁) and (V₂,G₂) which are action type geometrically equivalent and groups G₁ and G₂ are geometrically equivalent, but the representations (V₁,G₁) and (V₂,G₂) ...
  • Energy of Smith graphs 
    Sharma, P.; Naresh, R.; Sharma, U. (Algebra and Discrete Mathematics, 2020)
    In this manuscript, we have evaluated the energies of Smith graphs. In the course of the investigation, we found that only one Smith graph is hypo-energetic. Moreover, we have also established the energy bounds for Smith graphs.
  • General formal local cohomology modules 
    Rezaei Sh. (Algebra and Discrete Mathematics, 2020)
    Let (R,m) be a local ring, Ф a system of ideals of R and M a finitely generated R-module. In this paper, we define and study general formal local cohomology modules. We denote the i-th general formal local cohomology module ...
  • Groups whose lattices of normal subgroups are factorial 
    Rajhi, A. (Algebra and Discrete Mathematics, 2020)
    We prove that the groups G for which the lattice of normal subgroups N(G) is factorial are exactly the UND-groups, that is the groups for which every normal subgroup have a unique normal complement, with finite length.
  • Decompositions of set-valued mappings 
    Protasov, I. (Algebra and Discrete Mathematics, 2020)
  • Normal automorphisms of the metabelian product of free abelian Lie algebras 
    Öğüşlü, N.Ş. (Algebra and Discrete Mathematics, 2020)
    Let M be the metabelian product of free abelian Lie algebras of finite rank. In this study we prove that every normal automorphism of M is an IA-automorphism and acts identically on M′.
  • Some remarks about minimal prime ideals of skew Poincaré-Birkhoff-Witt extensions 
    Niño, A.; Reyes, A. (Algebra and Discrete Mathematics, 2020)
    In this paper, we characterize the minimal prime ideals of skew PBW extensions over several classes of rings. We unify different results established in the literature for Ore extensions, and extend all of them to a several ...
  • On the spectrum of Cayley graphs 
    Ghorbani, M.; Songhori, M. (Algebra and Discrete Mathematics, 2020)
    The set of eigenvalues of the adjacency matrix of a graph is called the spectrum of it. In the present paper, we introduce the spectrum of Cayley graphs of order pqr in terms of character table, where p, q, r are prime ...
  • Some properties of E(G,W,FTG) and an application in the theory of splittings of groups 
    Fanti, E.L.C.; Silva, L.S. (Algebra and Discrete Mathematics, 2020)
    Let us consider W a G-set and M a Z₂G-module, where G is a group. In this paper we investigate some properties of the cohomological the theory of splittings of groups. Namely, we give a proof of the invariant E(G,W,M), ...
  • Some results on the main supergraph of finite groups 
    Asboei, A.K.; Salehi, S.S. (Algebra and Discrete Mathematics, 2020)
    Let G be a finite group. The main supergraph S(G) is a graph with vertex set G in which two vertices x and y are adjacent if and only if o(x) | o(y) or o(y) | o(x). In this paper, we will show that G ≅ PSL(2, p) or PGL(2, ...
  • Normal form in Hecke-Kiselman monoids associated with simple oriented graphs 
    Aragona, R.; D'Andrea, A. (Algebra and Discrete Mathematics, 2020)
    We generalize Kudryavtseva and Mazorchuk’s concept of a canonical form of elements [9] in Kiselman’s semigroups to the setting of a Hecke-Kiselman monoid HKГ associated with a simple oriented graph Г. We use confluence ...

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