The board / graph theory / #1019
Erdős Problem #1019
PROVED LEANdatabase updated 2026-09-16
The statement as posed is true, and a proof exists. A solution has also been checked by machine, in Lean.
What the community database records, not our verdict. erdosproblems.com no longer shows statuses (why).
Prizenone
Topicsgraph theory, planar graphs
Statement in Leannot yet
Solution in Leanyes
Original pageerdosproblems.com/1019
Attempts
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