Search for: [Abstrakt = "Let p, q, rbe any three lines in the plane passing through a common point and suppose that O, P, Q, Rare any four collinear points such that P∈ p, Q ∈ q, R ∈ r, Pand Rare harmonic conjugates with respect to Oand Q\(that is, │OP│\/ │PQ│= │OR│\/│QR│\). For every k ≥2, we construct a set Xnof n= 4kpoints, which is distributed on the lines p, q, r, but each element of Xnᵕ\{O\} is incident to at most n\/2 lines spanned by Xnᵕ\{O\}."]

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