Use this tag for questions in graph theory. Here a graph is a collection of vertices and connecting edges. Use (graphing-functions) instead if your question is about graphing or plotting functions.

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Circumscribed Simple Line Arrangements Have Hamiltonian Circuits?

An arrangement of $s$ lines are drawn in the plane so that no three lines intersect at a common point and no two lines are parallel. Now circumscribe this arrangement by a circle so that all ...