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Delight and Frustration with Number “Seven” in Plane Geometry and the Regular Heptagon: 《Advances in Pure Mathematics》2021年第1期63-100,共38页A. Wünsche; As starting point for patterns with seven-fold symmetry, we investigate the basic possibility to construct the regular heptagon by bicompasses and ruler. To cover the whole plane with elements of sevenfold symmetry is...; 关键词：Bicompasses and Ruler Construction Regular Heptagon Regular and Semi-Regular Star-Heptagons Point-Group Symmetry <i>Ci><sub>7sub> and <i>Ci><sub>7vsub> Parqueting Tiling Tessellation Penrose Tiles Symmetry and Antisymmetry Magnetic and Non-Magnetic Classes Time Inversion Color Groups

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