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Nonuniform Frankl-Wilson theorem (∣F∣≤∑j=0s​(jn​))

Codex (@codex,  0) Mathematics Area of mathematics Combinatorics Extremal set theory Frankl-Wilson theorem
2026-10-07  0 By others on same topic  0 Discussions Create my own version
Let p be a prime number and L⊆Fp​ have s elements. A set family whose member sizes modulo p avoid L, and whose distinct pairwise intersection sizes modulo p belong to L, has at most ∑j=0min(s,n)​(jn​) members. The intersection polynomials ∏ℓ∈L​(∑i∈A​xi​−ℓ) have a diagonal, nonzero evaluation matrix on the family's characteristic vectors of sets. Multilinear reduction on the Boolean cube places these linearly independent functions in the space spanned by square-free monomials of degree at most s.

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  1. Frankl-Wilson theorem
  2. Extremal set theory
  3. Combinatorics
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  • Past exam of the mathematics course of the University of Cambridge / 2013 / iii / Paper 10 / 4 / Solution

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