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Erdős problem 214

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Let S⊂R2S\subset \mathbb{R}^2 be such that no two points in SS are distance 11 apart. Must the complement of SS contain four points which form a unit square?

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. Formal6 retained
  4. Resolutionproved (Lean)
  5. WorkNone recorded
  6. DecisionNone here
  7. The questionNot reached
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Where the source files it110 share a topic
Geometry110Distances55
Erdős problem 94accepted
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