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Abstract
We show that every T 1 wN-space is expandable and as a corollary, we prove that a ϑ-refinable sym-wg T 1 space is paracompact and thus two problems of Chris Good are solved. We also investigate s-expandability, and for extremally disconnected spaces, a characterization of s-expandability is given in terms of covers, which gives an extension to a known result.
