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{{DISPLAYTITLE:Ψ₀(Ω<sub>ω</sub>)}} | |||
{{correct title|Ψ<sub>0</sub>(Ω<sub>ω</sub>)}} | |||
In mathematics, '''Ψ<sub>0</sub>(Ω<sub>ω</sub>)''' is a [[large countable ordinal]] that is used to measure the proof-theoretic strength of some mathematical systems. In particular, it is the [[proof theoretic ordinal]] of the subsystem <math>\Pi_1^1</math>-CA<sub>0</sub> of [[second-order arithmetic]]; this is one of the "big five" subsystems studied in [[reverse mathematics]] (Simpson 1999). | |||
==Definition== | |||
{{Main|Ordinal collapsing function}} | |||
* <math>\Omega_0 = 0</math>, and <math>\Omega_n = \aleph_n</math> for ''n'' > 0. | |||
* <math>C_i(\alpha)</math> is the smallest set of ordinals that contains <math>\Omega_n</math> for ''n'' finite, and contains all ordinals less than <math>\Omega_i</math>, and is closed under ordinal addition and exponentiation, and contains <math>\Psi_j(\xi)</math> if ''j'' ≥ ''i'' and <math>\xi \in C_i(\alpha)</math> and <math>\xi < \alpha</math>. | |||
* <math>\Psi_i(\alpha)</math> is the smallest ordinal not in <math>C_i(\alpha)</math> | |||
==References== | |||
* G. Takeuti, ''Proof theory'', 2nd edition 1987 ISBN 0-444-10492-5 | |||
* K. Schütte, ''Proof theory'', Springer 1977 ISBN 0-387-07911-4 | |||
* {{Citation | last1=Simpson | first1=Stephen G. | title=Subsystems of second order arithmetic | url=http://www.math.psu.edu/simpson/sosoa/ | publisher=[[Cambridge University Press]] | edition=2nd | series=Perspectives in Logic | isbn=978-0-521-88439-6 | id={{MathSciNet | id = 2517689}} | year=2009}} | |||
{{countable ordinals}} | |||
{{DEFAULTSORT:Psi0(Omega Omega)}} | |||
[[Category:Ordinal numbers]] | |||
[[Category:Proof theory]] | |||
{{Settheory-stub}} |
Revision as of 20:17, 1 February 2014
Template:Correct title In mathematics, Ψ0(Ωω) is a large countable ordinal that is used to measure the proof-theoretic strength of some mathematical systems. In particular, it is the proof theoretic ordinal of the subsystem -CA0 of second-order arithmetic; this is one of the "big five" subsystems studied in reverse mathematics (Simpson 1999).
Definition
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- , and for n > 0.
- is the smallest set of ordinals that contains for n finite, and contains all ordinals less than , and is closed under ordinal addition and exponentiation, and contains if j ≥ i and and .
- is the smallest ordinal not in
References
- G. Takeuti, Proof theory, 2nd edition 1987 ISBN 0-444-10492-5
- K. Schütte, Proof theory, Springer 1977 ISBN 0-387-07911-4
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