The $\sigma$-point-finite $cn$-networks ($ck$-networks) of Pixley-Roy hyperspaces


L. Q. Tuyen, O. V. Tuyen




In this paper, we study the relation between a space $X$ satisfying certain generalized metric properties and the Pixley-Roy hyperspace $\mathcal F[X]$ over $X$ satisfying the same properties. We prove that if $X$ has a $\sigma$-point-finite $cn$-network (resp., $ck$-network), then $\mathcal F[X]$ also has a $\sigma$-point-finite $cn$-network (resp., $ck$-network).