Buchholz's notationBuchholz psi functionsComputable ordinalFeferman's functionGaisi TakeutiGentzen's consistency proofHistory of mathematical notationHyperarithmetical theoryKleene's OLarge countable ordinalLimit ordinalNotationOrdinal analysisOrdinal arithmeticOrdinal collapsing functionOrdinal diagramOrdinal diagramsOrdinal notationsPsi (Greek)Theta function (disambiguation)
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Ordinal notation
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