DIRECTIONAL LOWER POROSITY

被引：0
|
作者：
Speight, Gareth [1 ]
机构：
[1] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy
来源：
REAL ANALYSIS EXCHANGE | 2013年 / 39卷 / 01期
基金：
英国工程与自然科学研究理事会;
关键词：
Lower Porosity; Directed Porosity; Directionally Porous; Sigma Porous;
D O I：
暂无
中图分类号：
O1 [数学];
学科分类号：
0701 ; 070101 ;
摘要：
We investigate differences between upper and lower porosity, In finite dimensional Banach spaces every upper porous set is directionally upper porous. We show the situation is very different for lower porous sets; there exists a lower porous set in R-2 which is not even a countable union of directionally lower porous sets.
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页码：45 / 55
页数：11
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