文章基本信息

标题：Properties of some <mml:math alttext="$\ast$" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>∗</mml:mi></mml:math>-dense-in-itself subsets
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作者：V. Renuka Devi ; D. Sivaraj ; T. Tamizh Chelvam 等
期刊名称：International Journal of Mathematics and Mathematical Sciences
印刷版ISSN：0161-1712
电子版ISSN：1687-0425
出版年度：2004
卷号：2004
DOI：10.1155/S0161171204403391
出版社：Hindawi Publishing Corporation
摘要：ℐ-open sets were introduced and studied by Janković and Hamlett (1990) to generalize the well-known Banach category theorem. Quasi-ℐ-openness was introduced and studied by Abd El-Monsef et al. (2000). These are ∗-dense-in-itself sets of the ideal spaces. In this note, properties of these sets are further investigated and characterizations of these sets are given. Also, their relation with ℐ-dense sets and ℐ-locally closed sets is discussed. Characterizations of completely codense ideals are given in terms of semi-preopen sets.