出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2010/11/15 08:14 UTC 版)
In mathematics, limit cardinals are certain cardinal numbers. A cardinal number λ is a weak limit cardinal if λ is neither a successor cardinal nor zero. This means that one cannot "reach" λ by repeated successor operations. These cardinals are sometimes called simply "limit cardinals" when the context is clear.