Geodesic
Hexagonal systems. a chemistry-motivated excursion to combinatorial geometry
The Teaching of Mathematics, X (2007) no. 1, p. 1
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Hexagonal systems are geometric objects obtained by arranging mutually congruent regular hexagons in the plane. Such geometric features are usually not considered in secondary-school courses of mathematics, although these are easy-to-grasp and probably interesting to students. In this paper the elements of the theory of hexagonal systems are outlined. We indicate some properties of hexagonal systems that secondary-school students could prove themselves, as well as a few less easy results and open problems.
Classification : 52C20 97A20 K34
Keywords: Hexagonal Systems, Tilings, Combinatorial Geometry, Benzenoid Hydrocarbons, Chemistry. 
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Ivan Gutman. Hexagonal systems. a chemistry-motivated excursion to combinatorial geometry. The Teaching of Mathematics, X (2007) no. 1, p. 1 . http://geodesic.mathdoc.fr/item/TM2_2007_X_1_a0/