Ekici, ErdalJafari, SaeidNoiri, Takashi2025-01-272025-01-2720081221-8421https://hdl.handle.net/20.500.12428/25143In 1996, DONTCHEV [4] introduced and investigated the notion of contra-continuity. In this paper we introduce and study the basic properties of upper (lower) contra-continuous multifunctions.eninfo:eu-repo/semantics/closedAccessstrongly S-closed spacemultifunctioncontra-continuityArticle5417585N/AWOS:000263339400007