Circle Packing Theorem
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High Quality Content by WIKIPEDIA articles! The circle packing theorem (also known as the Koebe Andreev Thurston theorem) describes the possible tangency relations between circles in the plane whose interiors are disjoint. A circle packing is a connected collection of circles (in general, on any Riemann surface) whose interiors are disjoint. The intersection graph (sometimes called the tangency graph or contact graph) of a circle packing is the graph having a vertex for each circle, and an edge for every pair of circles that are tangent. If the circle packing is on the plane, or, equivalently,…mehr

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High Quality Content by WIKIPEDIA articles! The circle packing theorem (also known as the Koebe Andreev Thurston theorem) describes the possible tangency relations between circles in the plane whose interiors are disjoint. A circle packing is a connected collection of circles (in general, on any Riemann surface) whose interiors are disjoint. The intersection graph (sometimes called the tangency graph or contact graph) of a circle packing is the graph having a vertex for each circle, and an edge for every pair of circles that are tangent. If the circle packing is on the plane, or, equivalently, on the sphere, then its intersection graph is called a coin graph. Coin graphs are always connected, simple, and planar.