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Erdős problem 1008

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Does every graph with mm edges contain a subgraph with ≫m2/3\gg m^{2/3} edges which contains no C4C_4?

Erdős Problems records this as proved (Lean).

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How far the record reaches4 of 6 stages
  1. Sourceerdos-problems
  2. StatementRetained
  3. Formal4 retained
  4. Resolutionproved (Lean)
  5. WorkNone recorded
  6. DecisionNone here
  7. The questionNot reached
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Where the source files it274 share a topic
Graph Theory275
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