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On a characterization of the recursively inaccessible ordinals

For a given set of numbers $A$, let $O^A$ be the hyperjump of $A$. It is possible to iterate inductively the hyperjump of a set, through the computable ordinals, in a way that the $\alpha$-th hyperjum …
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On a characterization of the recursively inaccessible ordinals

Well assuming that $\lambda^A$ is always the first recursively admissible which is bigger than $\omega_1^A$, which I think should be true, I think my question is after all not so interesting: Either …
Archimondain's user avatar