Dual graph

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Notion

Domain

Science and technology

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Dual graph”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Booyabazooka at English Wikipedia, Public domain, via Wikimedia Commons.