BabelNet

bn:00389852n

Noun Concept

ensemble projectif hiérarchie projective

In the mathematical field of descriptive set theory, a subset A {\displaystyle A} of a Polish space X {\displaystyle X} is projective if it is Σ n 1 {\displaystyle {\boldsymbol {\Sigma }}_{n}^{1}} for some positive integer n {\displaystyle n}. Wikipedia

Relations

Sources

IS A

sous-ensemble

Wikidata

ensemble projectif

Wikipedia Translations

ensemble projectif, hiérarchie projective