A new characterization of spaces with locally countable sn-networks

Abstract

In this paper we prove that a space $X$ is with a locallycountable $sn$-network (resp., weak base) if and only if it is acompact-covering (resp., compact-covering quotient) compact and$ss$-image of a metric space, if and only if it is asequentially-quotient (resp., quotient) $\pi$- and $ss$-image of ametric space, which gives a new characterization of spaces withlocally countable $sn$-networks (or weak bases).