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E6 lattice : ウィキペディア英語版
2 22 honeycomb


|-
|bgcolor=#e7dcc3|4-face type||
|-
|bgcolor=#e7dcc3|Cell type||
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|bgcolor=#e7dcc3|Face type||
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|bgcolor=#e7dcc3|Face figure||× duoprism
|-
|bgcolor=#e7dcc3|Edge figure||t2 25px
|-
|bgcolor=#e7dcc3|Vertex figure||122
|-
|bgcolor=#e7dcc3|Coxeter group||
In geometry, the 222 honeycomb is a uniform tessellation of the six-dimensional Euclidean space. It can be represented by the Schläfli symbol . It is constructed from 221 facets and has a 122 vertex figure, with 54 221 polytopes around every vertex.
Its vertex arrangement is the ''E6 lattice'', and the root system of the E6 Lie group so it can also be called the E6 honeycomb.
==Construction==

It is created by a Wythoff construction upon a set of 7 hyperplane mirrors in 6-dimensional space.
The facet information can be extracted from its Coxeter–Dynkin diagram, .
Removing a node on the end of one of the 2-node branches leaves the 221, its only facet type,
The vertex figure is determined by removing the ringed node and ringing the neighboring node. This makes 122, .
The edge figure is the vertex figure of the vertex figure, here being a birectified 5-simplex, ''t''2, .
The face figure is the vertex figure of the edge figure, here being a triangular duoprism, ×, .

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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