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Everything about Dual graph

Graph representing faces of another graph

In the mathematical discipline of graph theory, the dual graph of a planar graph G is a graph that has a vertex for each face of G. The dual graph has an edge for each pair of faces in G that are separated from each other by an edge, and a self-loop when the same face appears on both sides of an edge. Thus, each edge e of G has a corresponding dual edge, whose endpoints are the dual vertices corresponding to the faces on either side of e. The definition of the dual depends on the choice of embedding of the graph G, so it is a property of plane graphs rather than planar graphs. For planar graphs generally, there may be multiple dual graphs, depending on the choice of planar embedding of the graph. Wikipedia →

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  1. Read the overview: Dual graphA 5-minute orientation
  2. Skim a recent paper: Unraveling the dual defect sites in graphite carbon nitride for ultra-high photocatalytic H 2 O 2 evolutionInfluential work since 2022
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  5. Go sideways: Spanning treeA closely related topic
  6. Go sideways: Graphic matroidA closely related topic

📖 Definitions

Noun A graph derived from some plane graph in such a way that the derived graph has a vertex corresponding to each face of the given graph, an edge corresponding to each edge of the given graph that is shared by a pair of distinct faces, and a self-loop for each edge of the given graph that is a border of the same face on both of its sides.

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