Thin Subsets of Groups
For a group G and a natural number m, a subset A of G is called m-thin if, for each finite subset F of G, there exists a finite subset K of G such that |Fg ∩ A| ≤ m for all g ∈ G \ K. We show that each m-thin subset of an Abelian group G of cardinality ℵn, n = 0, 1, . . . can be split into ≤ mⁿ⁺¹ 1-...
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| Date: | 2013 |
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| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Published: |
Інститут математики НАН України
2013
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| Series: | Український математичний журнал |
| Subjects: | |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Thin Subsets of Groups / I.V. Protasov, S. Slobodyanyuk // Український математичний журнал. — 2013. — Т. 65, № 9. — С. 1245–1253. — Бібліогр.: 14 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | For a group G and a natural number m, a subset A of G is called m-thin if, for each finite subset F of G, there exists a finite subset K of G such that |Fg ∩ A| ≤ m for all g ∈ G \ K. We show that each m-thin subset of an Abelian group G of cardinality ℵn, n = 0, 1, . . . can be split into ≤ mⁿ⁺¹ 1-thin subsets. On the other hand, we construct a group G of
cardinality ℵω and select a 2-thin subset of G which cannot be split into finitely many 1-thin subsets. |
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