Jun, Young BaeJeong, Seong WooLee, Hyeon JeongLee, Joon Woo2017-09-052017-09-052008-10-011576-9402https://riunet.upv.es/handle/10251/86434[EN] Using the concept of pre-open set, we introduce and study topological properties of pre-limit points, pre-derived sets, preinterior and pre-closure of a set, pre-interior points, pre-border, prefrontier and pre-exterior. The relations between pre-derived set (resp. pre-limit point, pre-interior (point), pre-border, pre-frontier, and preexterior) and α-derived set (resp. α-limit point, α-interior (point), α-border, α-frontier, and α-exterior) are investigatedReconocimiento - No comercial - Sin obra derivada (by-nc-nd)Pre-limit pointPre-derived setPre-interiorPre-closurePre-interior pointsPre-borderPre-frontierPre-exteriorArtículo2017-09-0510.4995/agt.2008.1802Abierto1989-4147