🌐EnglishEnglishDeutschFrançaisPolski한국어中文日本語EntityQ219448· pop 5· linked from 32 articlesprojective setAlso known as projective hierarchyin descriptive set theory, a subset of a Polish space constructible by taking complements and projections of an analytic setAvailable in 5 languagesDeutsch日本語Polski한국어via Wikidata sitelinks · CC0ConnectionsInternational Standard Book NumberEntitynatural numberEntityCategoriesDescriptive set theoryMathematical logic hierarchies