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bn:00389852n
Noun Concept
FR
ensemble projectif  hiérarchie projective
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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
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