Two Quaternionic 4-Polytopes

Two Quaternionic 4-Polytopes
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两个四元数 4-多胞体

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发表时间:
1981
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通讯作者:
S. G. Hoggar
S. G. Hoggar
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文献类型:
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作者:
S. G. Hoggar

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一个凸多面体的性质是顶点集定义了实际的细分为边、三角形等。胞元(维数n-1)是顶点的凸船体与其边界超平面的交点。这些单元相交成(n-2)维元素,以此类推,所有这些都是有限的。但对于一个多面体在Escherichn凸性是不可用的;有一些纬度的各种元素(现在的子空间),受适当的条件,他们的发病率。例如,分数多面体(frac{1}{3}gamma _3^3)和广义交叉多面体( eta _3^3)[10]在顶点和“边”上一致,但第一个有18个“三角形”,而第二个有27个。
One property of a (convex) polytope in ℝ n is that the vertex set defines the actual subdivision into edges, triangles, etc. The cells (dimension n − 1) are the intersections of the convex hull of the vertices with its bounding hyperplanes. The cells intersect in (n − 2)-dimensional elements, and so on. All these are finite. But for a polytope in ℂ n convexity is not available; there is some latitude as to the various elements (now subspaces), subject to suitable conditions on their incidences. For example the fractional polytope ( frac{1}{3}gamma _3^3 ) and generalized cross polytope ( eta _3^3 ) [10] agree as to vertices and “edges,” but the first has 18 “triangles” whereas the second has 27.