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graphs that can be embedded into the plane, i.e. that can be drawn without crossings between the lines representing edges.
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Generalizations of Planar Graphs
Planar graphs can be characterized in terms of various minor monotone graph invariants such as $\mu(G)$ of Colin de Verdière, or the recent $\sigma(G)$ of Van der Holst and Pendavingh. A graph $G$ is …