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List of functions: Difference between revisions
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* [[buchholz_psi|Buchholz's psi]]
* [[extended_buchholz_psi|Extended Buchholz's psi]]
* Rathjen's OCFs: Michael Rathjen made a variety of ordinal collapsing functions for proof-theoretic purposes, these include:
** Rathjen's \( \psi \) for an ordinal analysis of KPM.
** Rathjen's \( \Psi \) for an ordinal analysis of KP with the \( \Pi_3 \)-reflection schema adjoined.
** Rathjen's \( \Psi \) for an ordinal analysis of lightface (parameterless) \( \Pi^1_2 \)-comprehension, which is equivalent to KP plus the assertion that there exists a stable ordinal.
* Arai's OCFs<sup>(sort out)</sup>
* Stegert's OCFs<sup>(sort out)</sup>
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