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Strip Algebra is a set of elements and operators for the description of carbon nanotube structures, considered as a subgroup of polyhedra, and more precisely, of polyhedra with vertices formed by three edges. This restriction is imposed on the polyhedra because carbon nanotubes are formed of sp2 carbon atoms. Strip Algebra was developed initially for the determination of the structure connecting two arbitrary nanotubes, but has also been extended to the connection of three identical nanotubes ==Background== Graphitic systems are molecules and crystals formed of carbon atoms in sp2 hybridization. Thus, the atoms are arranged on a hexagonal grid. Graphite, nanotubes, and fullerenes are examples of graphitic systems. All of them share the property that cach atom is bonded to three others (3-valent). The relation between the number of vertices, edges and faces of any finite polyhedron is given by Euler's polyhedron formula: : where ''e'', ''f'' and ''v'' are the number of edges, faces and vertices, respectively, and ''g'' is the genus of the polyhedron, i.e., the number of "holes" in the surface. For example, a sphere is a surface of genus 0, while a torus is of genus 1. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「strip algebra」の詳細全文を読む スポンサード リンク
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