Limit ordinal

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What Wikipedia says

In set theory, a limit ordinal is an ordinal number that is neither zero nor a successor ordinal. Alternatively, an ordinal λ is a limit ordinal if there is an ordinal less than λ, and whenever β is an ordinal less than λ, then there exists an ordinal γ such that β < γ < λ.

Excerpt from the Wikipedia article “Limit ordinal”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jochen Burghardt, CC0, via Wikimedia Commons.