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Erdős problem 1126

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If f(x+y)=f(x)+f(y)f(x+y)=f(x)+f(y) for almost all x,y∈Rx,y\in \mathbb{R} then there exists a function gg such that g(x+y)=g(x)+g(y)g(x+y)=g(x)+g(y) for all x,y∈Rx,y\in\mathbb{R} such that f(x)=g(x)f(x)=g(x) for almost all xx.

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  2. StatementRetained
  3. Formal1 retained
  4. Resolutionproved (Lean)
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  6. DecisionNone here
  7. The questionNot reached
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