AbstractThe notion of a finitely closure-preserving family is introduced. The class of all spaces with a σ-finitely closure-preserving base is an intermediate between that of stratifiable μ-spaces and that of M1-spaces. It is proved that the class is closed under taking arbitrary subspaces, countable products and perfect images. An internal characterization of the perfect images of a stratifiable μ-space is given
AbstractThis paper deals with the study of closed images or quasi-perfect images of Nagata spaces, c...
AbstractWe prove that if X is a σ-compact Polish space, then the space Ck(X) of all continuous real-...
AbstractIto showed that stratifiable spaces in which there is a closure preserving local base at eac...
AbstractThe notion of a finitely closure-preserving family is introduced. The class of all spaces wi...
AbstractWe show that every closed subset of an M1-space has a closure-preserving open neighborhood b...
AbstractWe show that the following classes of topological spaces coincide: (1) stratifiable μ-spaces...
AbstractWe introduce a technical property (P) and use it to show that every M3-space with (P) is an ...
Abstract. We prove that if X is a σ-compact Polish space, then the space Ck(X) of all continuous rea...
AbstractLet X be an M3-space. If every point of X has a closure preserving outer base, then X is an ...
AbstractThe main result shows that the class of spaces with a δθ-base is invariant under perfect map...
Abstract. In this paper, we prove the following theorem which gives a characterization of M1-spaces ...
AbstractIt is shown that the class F of compact T1 spaces is the union of classes Fμ, one for each i...
AbstractWe define a pair (F,U) to be a closed set F and an open set U such that F ⊂ U. A sequence of...
This thesis deals with study of mappings preserving Borel classes or absolute Borel classes. We prov...
AbstractWe introduce the notion of M-structures and consider the class M of stratifiable spaces with...
AbstractThis paper deals with the study of closed images or quasi-perfect images of Nagata spaces, c...
AbstractWe prove that if X is a σ-compact Polish space, then the space Ck(X) of all continuous real-...
AbstractIto showed that stratifiable spaces in which there is a closure preserving local base at eac...
AbstractThe notion of a finitely closure-preserving family is introduced. The class of all spaces wi...
AbstractWe show that every closed subset of an M1-space has a closure-preserving open neighborhood b...
AbstractWe show that the following classes of topological spaces coincide: (1) stratifiable μ-spaces...
AbstractWe introduce a technical property (P) and use it to show that every M3-space with (P) is an ...
Abstract. We prove that if X is a σ-compact Polish space, then the space Ck(X) of all continuous rea...
AbstractLet X be an M3-space. If every point of X has a closure preserving outer base, then X is an ...
AbstractThe main result shows that the class of spaces with a δθ-base is invariant under perfect map...
Abstract. In this paper, we prove the following theorem which gives a characterization of M1-spaces ...
AbstractIt is shown that the class F of compact T1 spaces is the union of classes Fμ, one for each i...
AbstractWe define a pair (F,U) to be a closed set F and an open set U such that F ⊂ U. A sequence of...
This thesis deals with study of mappings preserving Borel classes or absolute Borel classes. We prov...
AbstractWe introduce the notion of M-structures and consider the class M of stratifiable spaces with...
AbstractThis paper deals with the study of closed images or quasi-perfect images of Nagata spaces, c...
AbstractWe prove that if X is a σ-compact Polish space, then the space Ck(X) of all continuous real-...
AbstractIto showed that stratifiable spaces in which there is a closure preserving local base at eac...
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