How weak is weak extent?
General Topology
2007-05-23 v1
Abstract
A space X is star-Lindelof provided for every open cover U there is a finite subset A of X such that St(A,U)=X. We show that a Tychonoff star-Lindelof space can have arbitraryly big extent while the extent of a normal star-Lindelof space can not be greater than c.
Cite
@article{arxiv.math/0006198,
title = {How weak is weak extent?},
author = {Mikhail Matveev},
journal= {arXiv preprint arXiv:math/0006198},
year = {2007}
}