Source: wikibot/teichmuller-tukey-lemma
= Teichmüller–Tukey lemma
{wiki=Teichmüller–Tukey_lemma}
The Teichmüller–Tukey lemma is a result in set theory and topology, particularly in the study of families of sets and their combinatorial properties. The lemma states that for certain types of families of sets, there is a particular way to extract a subset with specific properties.