Δ-システム補題
1. Sunflower (mathematics)In mathematics, a sunflower or Δ system is a collection of sets whose pairwise intersection is constant, and called the kernel. The Δ-lemma, sunflower lemma, and sunflower conjecture give various conditions that imply the existence of a large sunflower in a given collection of sets. The original term for this concept was "Δ-system". More recently the term "sunflower", possibly introduced by Deza & Frankl (1981), has been gradually replacing it.
Read “Sunflower (mathematics)” on English Wikipedia
Read “Δ-システム補題” on Japanese Wikipedia
Read “Sunflower (mathematics)” on DBpedia
Read “Sunflower (mathematics)” on English Wikipedia
Read “Δ-システム補題” on Japanese Wikipedia
Read “Sunflower (mathematics)” on DBpedia
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