Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4658643 | Topology and its Applications | 2014 | 12 Pages |
Abstract
We define some monotone properties using stars of coverings. This relates to work of J. van Mill, V. Tkachuk, R. Wilson, O. Alas, L. Junqueira, M. Matveev and others who generalized the D-space property of E. van Douwen and E. Michael. Given a property P, we call a topological space X monotonically star-P if one can assign to each open cover U a subspace s(U)âX with property P in such a way that st(s(U),U)=â{UâU:Uâ©s(U)â â
}=X and if V refines U then s(U)âs(V). We study monotonically star-P spaces for various compactness-like properties P.
Keywords
Related Topics
Physical Sciences and Engineering
Mathematics
Geometry and Topology
Authors
Strashimir G. Popvassilev, John E. Porter,