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См. также в других словарях:

  • Scheinerman's conjecture — In mathematics, Scheinerman s conjecture states that every planar graph is the intersection graph of a set of line segments in the plane. This conjecture was formulated by E. R. Scheinerman in his Ph.D. thesis (1984), following earlier results… …   Wikipedia

  • Triangle-free graph — In the mathematical area of graph theory, a triangle free graph is an undirected graph in which no three vertices form a triangle of edges. Triangle free graphs may be equivalently defined as graphs with clique number ≤ 2, graphs with girth ≥ 4,… …   Wikipedia

  • Grötzsch graph — infobox graph name = Grötzsch graph namesake = Herbert Grötzsch vertices = 11 edges = 20 chromatic number = 4 chromatic index = girth = 4 properties = The Grötzsch graph is a triangle free graph with 11 vertices, 20 edges, and chromatic number 4 …   Wikipedia

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