Delta-system lemma
= Delta-system lemma
{wiki}
Every uncountable family of finite sets has an uncountable subfamily whose distinct members have the same pairwise intersection, called the root. It is also known as the sunflower lemma.
= Delta-system lemma
{wiki}
Every uncountable family of finite sets has an uncountable subfamily whose distinct members have the same pairwise intersection, called the root. It is also known as the sunflower lemma.