Statements (18)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:ordinal_number
|
| gptkbp:alsoKnownAs |
Howard ordinal
|
| gptkbp:describedBy |
proof theory
|
| gptkbp:firstDescribed |
1965
|
| gptkbp:isCountable |
true
|
| gptkbp:isLimitOrdinal |
true
|
| gptkbp:namedAfter |
gptkb:William_Alvin_Howard
gptkb:Heinz_Bachmann |
| gptkbp:notation |
ordinal collapsing function
|
| gptkbp:rank |
gptkb:Feferman–Schütte_ordinal
|
| gptkbp:relatedTo |
gptkb:second-order_arithmetic
impredicative theories |
| gptkbp:symbol |
ψ(Ω_Ω) or ψ(ε_{Ω+1})
|
| gptkbp:usedIn |
analysis of predicative systems
|
| gptkbp:bfsParent |
gptkb:Kurt_Schütte
gptkb:Feferman–Schütte_ordinal |
| gptkbp:bfsLayer |
6
|
| https://www.w3.org/2000/01/rdf-schema#label |
Bachmann–Howard ordinal
|