ELMO 2010 Problem 1
Determine all (not necessarily finite) sets of points in the plane such that given any four distinct points in , there is a circle passing through all four or a line passing through some three.
Carl Lian.
Dataset text AI-MO AoPS. Quoted with source.
Official text: ELMO 2010 official paper, page 1.
Solutions
No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.
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