A new maximal-independent-set formulation for periodic unit-distance-free sets in the plane is tested and shown, in the parameter range tried, not to beat Croft's 1967 density lower bound of 0.22936.
Discrete & Computational Geometry 67, 1–12 (06 2022)
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On lower bounds of the density of planar periodic sets without unit distances
A new maximal-independent-set formulation for periodic unit-distance-free sets in the plane is tested and shown, in the parameter range tried, not to beat Croft's 1967 density lower bound of 0.22936.