Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:mathematical_concept
|
| gptkbp:characterizedBy |
complexity of sets in topological spaces
|
| gptkbp:describes |
classification of Borel sets
|
| gptkbp:field |
gptkb:set_theory
gptkb:descriptive_set_theory |
| gptkbp:generalizes |
gptkb:projective_hierarchy
|
| https://www.w3.org/2000/01/rdf-schema#label |
Borel hierarchy
|
| gptkbp:introduced |
gptkb:Émile_Borel
|
| gptkbp:level |
Π^0_n
Σ^0_n |
| gptkbp:lowerAward |
open sets
closed sets |
| gptkbp:namedAfter |
gptkb:Émile_Borel
|
| gptkbp:relatedTo |
gptkb:Borel_sets
gptkb:Polish_space |
| gptkbp:usedIn |
gptkb:logic
gptkb:topology analysis |
| gptkbp:bfsParent |
gptkb:Borel_sets
gptkb:Luzin_hierarchy gptkb:Wadge_hierarchy gptkb:projective_hierarchy |
| gptkbp:bfsLayer |
7
|