Source: wikibot/large-countable-ordinal
= Large countable ordinal
{wiki=Large_countable_ordinal}
In set theory, large countable ordinals refer to ordinals that are countably infinite but possess certain "large" properties that make them significant in the context of ordinal numbers. First, let's clarify some fundamental concepts. 1. **Ordinals**: Ordinal numbers extend the idea of natural numbers to describe the order type of well-ordered sets.