Statements (14)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:Titan
|
| gptkbp:expressedIn |
existence of sets definable by Pi-1-1 formulas
|
| gptkbp:field |
gptkb:logic
gptkb:set_theory |
| https://www.w3.org/2000/01/rdf-schema#label |
Pi-1-1 Comprehension Axiom
|
| gptkbp:implies |
gptkb:arithmetical_comprehension_axiom
|
| gptkbp:powers |
stronger than arithmetical comprehension axiom
|
| gptkbp:relatedTo |
gptkb:descriptive_set_theory
gptkb:second-order_arithmetic |
| gptkbp:symbol |
Π₁¹-CA
|
| gptkbp:usedIn |
gptkb:reverse_mathematics
axiomatic systems |
| gptkbp:bfsParent |
gptkb:Π^1_1-CA_0
|
| gptkbp:bfsLayer |
8
|