Перегляд за автором "Protasova, O.I."

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  • Color-detectors of hypergraphs 
    Protasov, I.V.; Protasova, O.I. (Algebra and Discrete Mathematics, 2005)
    Let X be a set of cardinality k, F be a family of subsets of X. We say that a cardinal λ,λ<k, is a color-detector of the hypergraph H=(X,F) if card χ(X)≤λ for every coloring χ:X→k such that card χ(F)≤λ for every F∈F. ...
  • Pseudodiscrete balleans 
    Protasova, O.I. (Algebra and Discrete Mathematics, 2006)
    A ballean B is a set X endowed with some family of subsets of X which are called the balls. The properties of the balls are postulated in such a way that a ballean can be considered as an asymptotic counterpart of a ...