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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5 retained statements2415f78e850a

FormalConjectures/ErdosProblems/

723.lean

Retained formal statement3 of 5

It is open whether there exists a projective plane of order 12.

FormalConjectures/ErdosProblems/723.leanErdos723.erdos_723.variants.eq_121 lineExact file

1True ↔ ∃ P L x x_1 x_2 pp, Configuration.ProjectivePlane.order P L = 12

OpenStatement only, no proof