Перегляд за автором "Lutsenko, Ie."

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  • Relatively thin and sparse subsets of groups 
    Lutsenko, Ie.; Protasov, I.V. (Український математичний журнал, 2011)
    Let G be a group with identity e and let I be a left-invariant ideal in the Boolean algebra PG of all subsets of G. A subset A of G is called I-thin if gA⋂A∈I for every g∈G {e}. A subset A of G is called I-sparse if, for ...