Перегляд за автором "Protasov, I.V."

Сортувати за: Порядок: Результатів:

  • Ultrafilters on G-spaces 
    Petrenko, O.V.; Protasov, I.V. (Algebra and Discrete Mathematics, 2015)
    For a discrete group G and a discrete G-space X, we identify the Stone-Cech compactifications βG and βX with the sets of all ultrafilters on G and X, and apply the natural action of βG on βX to characterize large, thick, ...
  • 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 ...