Перегляд за автором "Protasova, K."

Сортувати за: Порядок: Результатів:

  • Coarse structures on groups defined by conjugations 
    Protasov, I.; Protasova, K. (Algebra and Discrete Mathematics, 2021)
  • Kaleidoscopical configurations 
    Protasov, І.; Protasova, K. (Український математичний вісник, 2014)
    Let G be a group and X be a G-space with the action G × X → X, (g, x) → gx. A subset A of X is called a kaleidoscopical configuration if there is a coloring χ : X → k (i.e. a mapping of X onto a cardinal k) such that the ...
  • On free vector balleans 
    Protasov, I.; Protasova, K. (Algebra and Discrete Mathematics, 2019)
    A vector balleans is a vector space over R endowed with a coarse structure in such a way that the vector operations are coarse mappings. We prove that, for every ballean (X, E), there exists the unique free vector ballean ...
  • The comb-like representations of cellular ordinal balleans 
    Protasov, I.; Protasova, K. (Algebra and Discrete Mathematics, 2016)
    Given two ordinal λ and γ, let f:[0,λ)→[0,γ) be a function such that, for each α<γ, sup{f(t):t∈[0,α]}<γ. We define a mapping df:[0,λ)×[0,λ)⟶[0,γ) by the rule: if x<y then df(x,y)=df(y,x)=sup{f(t):t∈(x,y]}, d(x,x)=0. The ...