Properties of some -dense-in-itself subsets.
We introduce a new class of spaces, called Hausdorff modulo or mod spaces with respect to an ideal which contains the class of all Hausdorff spaces. Characterizations of these spaces are given and their properties are investigated. The concept of compactness modulo an ideal was introduced by Newcomb in 1967 and studied by Hamlett and Jankovic in 1990. We study the properties of -compact subsets in Hausdorff modulo spaces and generalize some results of Hamlett and Jankovic. -regular...
A new class of spaces which contains the class of all normal spaces is defined and its characterization and properties are discussed.
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