List of ordinals: Difference between revisions
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** \( \zeta \), the supremum of all eventually writable ordinals
** \( \Sigma \), the supremum of all accidentally writable ordinals
* Welch's \(E_0\)-ordinals <ref>P. D. Welch, [https://web.archive.org/web/20130108001818/https://maths.bris.ac.uk/~mapdw/det17.pdf Weak Systems of Determinacy and Arithmetical Quasi-Inductive Definitions] (April 2010 draft). Accessed 11 January 2023.</ref>
* The smallest [[gap_ordinals|gap ordinal]]<ref name="Gaps">W. Marek, M. Srebrny, [https://www.sciencedirect.com/science/article/pii/0003484374900059 Gaps in the Constructible Universe] (1973). Accessed 7 September 2022.</ref>
* Least start of a gap in the constructible universe of length 2<ref name="Gaps" />
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