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The Boerdijk–Coxeter helix, named after H. S. M. Coxeter and , is a linear stacking of regular tetrahedra, arranged so that the edges of the complex that belong to only one tetrahedron form three intertwined helices. There are two chiral forms, with either clockwise or counterclockwise windings. Unlike any other stacking of Platonic solids, the Boerdijk–Coxeter helix is not rotationally repetitive in 3-dimensional space. Even in an infinite string of stacked tetrahedra, no two tetrahedra will have the same orientation, because the helical pitch per cell is not a rational fraction of the circle. However, modified forms of this helix have been found which are rotationally repetitive, and in 4-dimensional space this helix repeats in rings of exactly 30 tetrahedral cells that tessellate the 3-

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  • The Boerdijk–Coxeter helix, named after H. S. M. Coxeter and , is a linear stacking of regular tetrahedra, arranged so that the edges of the complex that belong to only one tetrahedron form three intertwined helices. There are two chiral forms, with either clockwise or counterclockwise windings. Unlike any other stacking of Platonic solids, the Boerdijk–Coxeter helix is not rotationally repetitive in 3-dimensional space. Even in an infinite string of stacked tetrahedra, no two tetrahedra will have the same orientation, because the helical pitch per cell is not a rational fraction of the circle. However, modified forms of this helix have been found which are rotationally repetitive, and in 4-dimensional space this helix repeats in rings of exactly 30 tetrahedral cells that tessellate the 3-sphere surface of the 600-cell, one of the six regular convex polychora. Buckminster Fuller named it a tetrahelix and considered them with regular and irregular tetrahedral elements. (en)
  • La hélice de Boerdijk-Coxeter, llamada así por H. S. M. Coxeter y por A. H. Boerdijk, es un apilamiento lineal de tetraedros regulares, dispuestos de manera que las aristas del sólido compuesto al que pertenecen forman tres hélices entrelazadas, en las que quedan inscritos los vértices de cada tetraedro. Hay dos formas quirales, con enrollamientos en sentido horario o antihorario. A diferencia de cualquier otro apilamiento de sólidos platónicos, la hélice de Boerdijk-Coxeter no es rotacionalmente repetitiva en el espacio tridimensional. Incluso en una cadena infinita de tetraedros apilados, no hay dos tetraedros que tengan la misma orientación, porque el paso helicoidal por celda no es una fracción racional del círculo. Sin embargo, se han encontrado formas modificadas de esta hélice que son rotativamente repetitivas,​ y en el espacio 4-dimensional esta hélice se repite en anillos de exactamente 30 células tetraédricas que forman un mosaico en la superficie de la 3-esfera, de 600 células, uno de los seis policorones convexos regulares. Buckminster Fuller llamó este sólido tetrahelix, y lo consideró con elementos tetraédricos regulares e irregulares.​ (es)
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  • The Boerdijk–Coxeter helix, named after H. S. M. Coxeter and , is a linear stacking of regular tetrahedra, arranged so that the edges of the complex that belong to only one tetrahedron form three intertwined helices. There are two chiral forms, with either clockwise or counterclockwise windings. Unlike any other stacking of Platonic solids, the Boerdijk–Coxeter helix is not rotationally repetitive in 3-dimensional space. Even in an infinite string of stacked tetrahedra, no two tetrahedra will have the same orientation, because the helical pitch per cell is not a rational fraction of the circle. However, modified forms of this helix have been found which are rotationally repetitive, and in 4-dimensional space this helix repeats in rings of exactly 30 tetrahedral cells that tessellate the 3- (en)
  • La hélice de Boerdijk-Coxeter, llamada así por H. S. M. Coxeter y por A. H. Boerdijk, es un apilamiento lineal de tetraedros regulares, dispuestos de manera que las aristas del sólido compuesto al que pertenecen forman tres hélices entrelazadas, en las que quedan inscritos los vértices de cada tetraedro. Hay dos formas quirales, con enrollamientos en sentido horario o antihorario. A diferencia de cualquier otro apilamiento de sólidos platónicos, la hélice de Boerdijk-Coxeter no es rotacionalmente repetitiva en el espacio tridimensional. Incluso en una cadena infinita de tetraedros apilados, no hay dos tetraedros que tengan la misma orientación, porque el paso helicoidal por celda no es una fracción racional del círculo. Sin embargo, se han encontrado formas modificadas de esta hélice que s (es)
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  • Boerdijk–Coxeter helix (en)
  • Hélice de Boerdijk-Coxeter (es)
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