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erdos_723

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If there is a finite projective plane of order $n$ then must $n$ be a prime power?

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Lean 4 Statement 
theorem erdos_723 :
    answer(sorry) ↔ ∀ {P L : Type} (_: Membership P L) (_ : Fintype P) (_ : Fintype L),
      ∀ pp : ProjectivePlane P L, IsPrimePow pp.order
ID: ErdosProblems__723__erdos_723
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