Erdős·erdos:209

Erdős Problem 209

problem formal record: solved source: disproved (Lean) F2 declared

Machine-checked by qed.bot.

Fidelity F2: The statement corpus cites this proof against its own statement.

geometry·Source

AI activity

How grades work

AxiomProver

19 Jun 2026·supporting task

Escudero (2016)

full A1 V3 F2

Reasoning and sources

Autonomy

Secondary contribution: formalization

Details

proof to formalize: Escudero (2016)

Sources

Erdős problems AI wiki

Fidelity

How fidelity is graded

F2 declared. The statement corpus cites this proof against its own statement.

Checks

verified·qed.bot
25 theorems on the standard axioms only

proof rebuilt and axioms inspected·2026-08-21

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Formal material

Formal statements · 1

FormalConjectures/ErdosProblems/209.lean
1 declarations, 1 unproved goals·research solved

Cited proofs · 1

Jayyhk/erdos-lean/blob/110d489ed5c07e5b216453e092e9113127c98c9a/problems/209/Erdos209.lean
26 theorems, 0 unproved goals, 0 declared axioms

Also known as · 3

https://www.erdosproblems.com/209
https://github.com/google-deepmind/formal-conjectures/blob/main/FormalConjectures/ErdosProblems/209.lean
FormalConjectures/ErdosProblems/209.lean

Cite this record

qed.bot, “Erdős Problem 209”, https://qed.bot/s/erdos-209, as of 30 Sep 2026.

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