Statements (18)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:mathematical_concept
|
| gptkbp:concerns |
classification of definable sets of reals
|
| gptkbp:field |
gptkb:descriptive_set_theory
|
| gptkbp:introduced |
gptkb:Luzin
|
| gptkbp:level |
analytic sets
coanalytic sets projective sets at higher levels Π^1_n Σ^1_n |
| gptkbp:relatedTo |
gptkb:Polish_spaces
gptkb:Borel_hierarchy descriptive complexity |
| gptkbp:studies |
gptkb:projective_sets
|
| gptkbp:usedIn |
gptkb:logic
gptkb:set_theory |
| gptkbp:bfsParent |
gptkb:descriptive_set_theory
|
| gptkbp:bfsLayer |
6
|
| https://www.w3.org/2000/01/rdf-schema#label |
projective hierarchy
|