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Erdős problem 24

Does every triangle-free graph on 5n5n vertices contain at most n5n^5 copies of C5C_5?

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. Formal1 retained
  4. Resolutionproved (Lean)
  5. WorkNone recorded
  6. DecisionNone here
  7. The questionNot reached
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