Примеры использования Vertex figures на Английском языке и их переводы на Русский язык
{-}
-
Official
-
Colloquial
Their vertex figures are quasiregular triangular tilings.
Edges have p vertices, and vertex figures are r-gonal.
Their vertex figures are the simplices of one less dimension.
There are also the cases{p, 2,q}which have dihedral cells and hosohedral vertex figures.
Their vertex figures are skew polygons, zig-zagging between two planes.
Star forms have either regular star polygon faces or vertex figures or both.
Their vertex figures are icosahedral pentagonal polytopes of one less dimension.
For example, there are 4 regular star polyhedra with regular polygon or star polygon vertex figures.
Their cells and vertex figures are all regular hosohedra{2,n}, dihedra,{n, 2}, and Euclidean tilings.
It does not allow an easy way to describe a polytope whose facets are tori and whose vertex figures are projective planes, for example.
Their cells and vertex figures exist, but they do not cover a hypersphere with a finite number of repetitions.
It is called paracompact because it has infinite vertex figures, with all vertices as ideal points at infinity.
Like the 11-cell, it is also universal,being the only polytope with hemi-dodecahedral facets and hemi-icosahedral vertex figures.
The colored tetrahedal diagrams below are vertex figures for omnitruncated polytopes and honeycombs from each symmetry family.
He skipped the remaining six because he would not allow forms that failed the Euler characteristic on cells or vertex figures for zero-hole tori: F- E+ V 2.
These cases use 4.4.4.4 vertex figures of the square tiling, 3.3.3.3.3.3 vertex figure of the triangular tiling, as well as 60 degree rhombi divided double equilateral triangle faces, or a 60 degree trapezoid as three equilateral triangles.
For example, a traditional polytope is regular if all its facets and vertex figures are regular, but this is not necessarily so for an abstract polytope.
This condition alone is sufficient to ensure that any regular abstract polytope has isomorphic regular(n-1)-faces andisomorphic regular vertex figures.
In general, an abstract polytope is called locally X if its facets and vertex figures are, topologically, either spheres or X, but not both spheres.
In geometry, the regular skew polyhedra are generalizations to the set of regular polyhedron which include the possibility of nonplanar faces or vertex figures.
This means that its cells are all congruent regular polyhedra,and similarly its vertex figures are congruent and of another kind of regular polyhedron.
This is a series of questions such as For given abstract polytopes K and L,are there any polytopes P whose facets are K and whose vertex figures are L?
Uniform crossed antiprisms with a base{p} where p<3/2 cannot exist as their vertex figures would violate the triangular inequality; these are also marked with a large cross.
Ludwig Schläfli found four of them and skipped the last six because he would not allow forms that failed the Euler characteristic on cells or vertex figures for zero-hole tori.
The universal polytope with hemi-dodecahedral facets andicosahedral(not hemi-icosahedral) vertex figures is finite, but very large, with 10006920 facets and half as many vertices. .
A more general definition of regular polytopes which do not have simple Schläfli symbols includes regular skew polytopes andregular skew apeirotopes with nonplanar facets or vertex figures.
The cells(polyhedra), their faces(polygons),the polygonal edge figures and polyhedral vertex figures are identified by their Schläfli symbols.
Some notable examples of abstract regular polytopes that do not appear elsewhere in this list are the 11-cell,{3,5,3}, and the 57-cell,{5,3,5},which have regular projective polyhedra as cells and vertex figures.
Since there are no regular star n-polytopes for n≥ 5,that could be potential cells or vertex figures, there are no more hyperbolic star honeycombs in Hn for n≥ 5.
This honeycomb contains, that tile 2-hypercycle surfaces, similar to the paracompact tiling or It is one of 15 regular hyperbolic honeycombs in 3-space, 11 of which like this one are paracompact,with infinite cells or vertex figures.