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We characterise compact locales in terms of nearly perfect maps. We show in particular that these maps are the natural pointfree version of Bourbaki's proper maps - when defined via any ultrafillter - and that they extend Herrlich's notion of nearly closed sublocales .
Mathematics Subject Classication (2010): 06A15, 06B99, 06D22, 18B30, 18B99, 54D30.
Key words: Locales, frames, nearly perfect maps, nearly closed sublocales, compact,