Map Maker

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To a cartographer, a map is a divided area with boundaries between different regions. For a graph theorist, a map corresponds to a graph. When two regions share a border, they are considered connected. For a map on a planar region, such a graph is called a planar graph. In this Demonstration, click the internal black edges to change the map.
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Contributed by: Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA
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"Map Maker"
http://demonstrations.wolfram.com/MapMaker/
Wolfram Demonstrations Project
Published: March 7 2011