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Outerplanar graph
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===Colin de Verdière invariant=== A graph is outerplanar if and only if its [[Colin de Verdière graph invariant]] is at most two. The graphs characterized in a similar way by having Colin de Verdière invariant at most one, three, or four are respectively the linear forests, [[planar graph]]s, and [[linkless embedding|linklessly embeddable graphs]].
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