Erdős problem 723 · problems.science

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

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FormalConjectures/ErdosProblems/

723.lean

Retained formal statement4 of 5

This conjecture has been proved for $n \leq 11$ .

FormalConjectures/ErdosProblems/723.leanErdos723.erdos_723.variants.leq_112 linesExact file

1∀ {P L : Type} [inst : Membership P L] [Fintype P] [Fintype L] (pp : Configuration.ProjectivePlane P L),2  Configuration.ProjectivePlane.order P L ≤ 11 → IsPrimePow (Configuration.ProjectivePlane.order P L)

SolvedStatement only, no proof

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