Talk:Additively indecomposable ordinal

	Mathematics portal This article is within the scope of WikiProject Mathematics, a collaborative effort to improve the coverage of mathematics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.MathematicsWikipedia:WikiProject MathematicsTemplate:WikiProject Mathematicsmathematics articles
Low	This article has been rated as Low-priority on the project's priority scale.

Numbers

This article is within the scope of WikiProject Numbers, a collaborative effort to improve the coverage of Numbers on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.NumbersWikipedia:WikiProject NumbersTemplate:WikiProject NumbersNumbers articles

Multiplicative indecomposability of 2[edit]

Toshiyasu Arai says in [Arai, A sneak preview of proof theory of ordinals (p.7)] the quote "every multiplicative principal number $\alpha =\omega ^{\omega ^{\beta }}$ is ...". Is 2 considered multiplicatively indecomposable, but not multiplicatively principal? C7XWiki (talk) 22:34, 25 January 2021 (UTC)[reply]

History section[edit]

I'd like to see a brief section "History" in the article, mentioning who came up with the concept, and linking to a primary source. - Jochen Burghardt (talk) 16:35, 10 August 2021 (UTC)[reply]