共 50 条
On the ideal (ν0)
被引:3
|作者:
Kalemba, Piotr
[1
]
Plewik, Szymon
[1
]
Wojciechowska, Anna
[1
]
机构:
[1] Silesian Univ, Inst Math, PL-40007 Katowice, Poland
来源:
关键词:
base nu-matrix;
doughnut;
ideal type;
ideal (nu(0));
D O I:
10.2478/s11533-008-0021-0
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
The sigma-ideal (nu(0)) is associated with the Silver forcing, see [5]. Also, it constitutes the family of all completely doughnut null sets, see [9]. We introduce segment topologies to state some resemblances of (nu(0)) to the family of Ramsey null sets. To describe add(nu(0)) we adopt a proof of Base Matrix Lemma. Consistent results are stated, too. Halbeisen's conjecture cov(nu(0))= add(nu(0)) is confirmed under the hypothesis t = min{cf(c);r}. The hypothesis conv(nu(0)) = omega(1) implies that (nu(0)) has the ideal type (c, omega(1), c).
引用
收藏
页码:218 / 227
页数:10
相关论文