In the mathematical fields of set theory and extremal combinatorics, a sunflower or Δ {\displaystyle \Delta } -system is a collection of sets in which the intersection of any two distinct sets is the same. This common intersection is called the kernel of the sunflower.
In the mathematical fields of set theory and extremal combinatorics, a sunflower or Δ {\displaystyle \Delta } -system is a collection of sets in which the intersection of any two distinct sets is the same. This common intersection is called the kernel of the sunflower.
Source: Wikipedia "Sunflower (mathematics)" · CC BY-SA 4.0
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