勤勉
发表于 2025-3-26 21:29:19
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束缚
发表于 2025-3-27 04:16:48
Topological Density,We begin with some equivalents of this notion. A set . of non-zero elements of a BA . is said to be . provided that it satisfies the finite intersection property. And . is called κ-. if .{0} is the union of κ centered sets.
直觉没有
发表于 2025-3-27 07:19:43
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HACK
发表于 2025-3-27 12:22:40
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外露
发表于 2025-3-27 16:04:59
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加入
发表于 2025-3-27 20:08:01
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熔岩
发表于 2025-3-27 23:07:13
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chuckle
发表于 2025-3-28 05:25:20
,π-Character,First of all, note that if F is a non-principal ultrafilter on a BA ., then.. To see this, suppose that X is a finite set of non-zero elements of . which is dense in ..
芳香一点
发表于 2025-3-28 09:15:23
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Tartar
发表于 2025-3-28 11:32:40
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