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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-06-23 and was most recently seen on 2026-06-23.
In set theory, a branch of mathematics, an additively indecomposable ordinal α is any ordinal number that is not 0 such that for any , we have Additively indecomposable ordinals were named the gamma numbers by Cantor,p.20 and are also called additive principal numbers. The class of additively indecomposable ordinals may be denoted , from the German "Hauptzahl". The additively indecomposable ordinals are precisely those ordinals of the form for some ordinal .
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