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Перегляд Algebra and Discrete Mathematics, 2003, № 1 за назвою

Репозиторій DSpace/Manakin

Перегляд Algebra and Discrete Mathematics, 2003, № 1 за назвою

Сортувати за: Порядок: Результатів:

  • Almost all derivative quivers of artinian biserial rings contain chains 
    Avdeeva, T.; Ganyushkin, O. (Algebra and Discrete Mathematics, 2003)
    A lower estimate for the number Mn of all labelled quivers with n–vertex parts of Artinian biserial rings is given and the asymptotic of the relation Mn/Bn, where Bn denotes the number of those quivers all connected ...
  • An additive divisor problem in Z[i] 
    Savasrtu, O.V.; Varbanets, P.D. (Algebra and Discrete Mathematics, 2003)
  • A note on maximal ideals in ordered semigroups 
    Kehayopulu, N.; Ponizovskii, J.; Tsingelis, M. (Algebra and Discrete Mathematics, 2003)
    In commutative rings having an identity element, every maximal ideal is a prime ideal, but the converse statement does not hold, in general. According to the present note, similar results for ordered semigroups and ...
  • Direct decompositions of artinian modules related to formations of groups 
    Kurdachenko, L. A.; Otal, J. (Algebra and Discrete Mathematics, 2003)
    We survey direct decompositions of artinian modules over group rings into two summands where all the chief factors of the first are X–central and all the chief factors of the other is X–eccentric, where X is a certain ...
  • Green’s relations on the seminearring of full hypersubstitutions of type (n) 
    Changphas, Th.; Denecke, K. (Algebra and Discrete Mathematics, 2003)
    Hypersubstitutions are mappings which are used to define hyperidentities and solid varieties. In this paper we will show that the set of all hypersubstitutions of a given type forms a seminearring. We will give a full ...
  • Hyperbolic spaces from self-similar group actions 
    Nekrashevych, V. (Algebra and Discrete Mathematics, 2003)
    We show that the limit space of a contracting selfsimilar group action is the boundary of a naturally defined Gromov hyperbolic space.
  • Multi-algebras from the viewpoint of algebraic logic 
    Cırulis, J. (Algebra and Discrete Mathematics, 2003)
    Where U is a structure for a first-order language L ≈ with equality ≈, a standard construction associates with every formula f of L ≈ the set kfk of those assignments which fulfill f in U. These sets make up a (cylindric ...
  • On intersections of normal subgroups in free groups 
    Kulikova, O.V. (Algebra and Discrete Mathematics, 2003)
    Let N₁ (respectively N₂) be a normal closure of a set R₁ = {ui} (respectively R₂ = {vj}) of cyclically reduced words of the free group F(A). In the paper we consider geometric conditions on R₁ and R₂ for N₁ ∩ N₂ = [N₁, ...
  • Principal quasi-ideals of cohomological dimension 1 
    Novikov, B.V. (Algebra and Discrete Mathematics, 2003)
    We prove that a principal quasi-ideal of a noncommutative free semigroup has cohomological dimension 1 if and only if it is free.
  • Ramseyan variations on symmetric subsequences 
    Verbitsky, O. (Algebra and Discrete Mathematics, 2003)
    A theorem of Dekking in the combinatorics of words implies that there exists an injective order-preserving transformation f : {0, 1, . . . , n} → {0, 1, . . . , 2n} with the restriction f(i + 1) ≤ f(i) + 2 such that for ...
  • Uniform ball structures 
    Protasov, I.V. (Algebra and Discrete Mathematics, 2003)
    A ball structure is a triple B = (X, P, B), where X, P are nonempty sets and, for all x ∈ X, α ∈ P, B(x, α) is a subset of X, x ∈ B(x, α), which is called a ball of radius α around x. We introduce the class of uniform ...
  • Uniform ball structures 
    Protasov, I.V. (Algebra and Discrete Mathematics, 2003)
    A ball structure is a triple B = (X, P, B), where X, P are nonempty sets and, for all x ∈ X, α ∈ P, B(x, α) is a subset of X, x ∈ B(x, α), which is called a ball of radius α around x. We introduce the class of uniform ...

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