Omega^omega: Difference between revisions
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* The least limit of additive principal ordinals.
* The least ordinal which is, for all \( n < \omega \), an element of the class \( L^n(\mathrm{Ord}) \), where \( L \) is the limit point operator.
* The proof-theoretic ordinal of
* The proof-theoretic ordinal of
* The proof-theoretic ordinal of Peano arithmetic, with induction restricted to \( \Sigma^0_1 \)-formulae.
* The proof-theoretic ordinal of primitive recursive arithmetic.
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