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Erdős problem 199

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If A⊂RA\subset \mathbb{R} does not contain a 3-term arithmetic progression then must R\A\mathbb{R}\backslash A contain an infinite arithmetic progression?

Erdős Problems records this as disproved (Lean).

No Repository has ruled on it here.

How far the record reaches4 of 6 stages
  1. Sourceerdos-problems
  2. StatementRetained
  3. Formal1 retained
  4. Resolutiondisproved (Lean)
  5. WorkNone recorded
  6. DecisionNone here
  7. The questionNot reached
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Where the source files it26 share a topic
Arithmetic Progressions27
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