On the ultrafilter semigroup of a topological group

被引:6
|
作者
Zelenyuk, Yevhen [1 ]
机构
[1] Univ Witwatersrand, Sch Math, ZA-2050 Wits, South Africa
关键词
ultrafilter semigroup; topological group; Stone-Cech compactification; P-point; Bohr compactification;
D O I
10.1007/s00233-006-0607-4
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
The ultrafilter semigroup Ult(G) of a topological group G consists of all nonprincipal ultrafilters on G converging to the identity and is a closed subsemigroup in the Stone-Cech compactification beta G(d) of G as a discrete semigroup. We show that it is consistent with ZFC that for every countable nondiscrete topological group G, Ult(G) can be partitioned into closed right ideals each of which admits a continuous homomorphism onto the Bohr compactification of the integers.
引用
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页码:301 / 307
页数:7
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