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== Example application ==
The function ''f'' : Ord → Ord, ''f''(''α'') = ω<sub>''α''</sub> is normal (see [[initial ordinal]]). Thus, there exists an ordinal ''θ'' such that ''θ'' = ω<sub>''θ''</sub>. In fact, the lemma shows that there is a closed, unbounded class of such ''θ''.
==References==
{{refbegin}}
* {{cite book
| author = Levy, A.
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| year = 1908
| pages = 280–292
| doi= 10.2307/1988605
| issue = 3
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| issn= 0002-9947| doi-access = free
}}
{{refend}}
[[Category:Ordinal numbers]]
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