Jisho

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平面
Wikipedia definition
1. Planar graphIn graph theory, a planar graph is a graph that can be embedded in the plane, i.e. , it can be drawn on the plane in such a way that its edges intersect only at their endpoints. In other words, it can be drawn in such a way that no edges cross each other. A planar graph already drawn in the plane without edge intersections is called a plane graph or planar embedding of the graph.
Read “Planar graph” on English Wikipedia
Read “平面グラフ” on Japanese Wikipedia
Read “Planar graph” on DBpedia

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