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• 12:08, 30 August 2023 RhubarbJayde talk contribs created page Church-Kleene ordinal (Created page with "<nowiki>The Church-Kleene ordinal, commonly denoted \( \omega_1^{\mathrm{CK}} \) or \( \omega_1^{ck} \) is defined as the supremum of all "recursive ordinals". A recursive ordinal is the order-type of a well-order on the natural numbers which can be computed by a Turing machine. Note that all countable ordinals are the order-type of a well-order on the natural numbers, but there are only countably many Turing machines, and uncountably many countable ordinals, meaning the...") Tag: Visual edit