Conway's Thrackle Conjecture
A thrackle is an embedding of a graph in the plane, such that each edge is a Jordan arc and every pair of edges meet once. Edges may either meet at a common endpoint, or, if they have no endpoints in common, at a point in their interiors. In the latter case, the crossing must be transverse.
Read more about Conway's Thrackle Conjecture: Linear Thrackles, Thrackle Conjecture, Known Bounds
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