Namespaces
Variants
Actions

Difference between revisions of "User:Richard Pinch/sandbox-11"

From Encyclopedia of Mathematics
Jump to: navigation, search
(Start article: Honeycomb)
 
(Start article: Schläfli symbol)
Line 6: Line 6:
 
====References====
 
====References====
 
* H.S.M. Coxeter "Twisted honeycombs", Conference Board of the Mathematical Sciences. Regional Conference Series in Mathematics. No.4. American Mathematical Society (1970) ISBN 0-8218-1653-5  {{ZBL|0217.46502}}
 
* H.S.M. Coxeter "Twisted honeycombs", Conference Board of the Mathematical Sciences. Regional Conference Series in Mathematics. No.4. American Mathematical Society (1970) ISBN 0-8218-1653-5  {{ZBL|0217.46502}}
 +
* H.S.M. Coxeter,  "Regular complex polytopes" , Cambridge Univ. Press  (1974) ISBN 0-521-20125-X  {{ZBL|0732.51002}}
 +
 +
 +
=Schläfli symbol=
 +
A symbol encoding classes of polygons, polyhedra, polytopes and tessellations.
 +
 +
The symbol $\{p\}$ denotes a regular $p$-gon; the symbol $\{p,q\}$ a polyhedron with faces which are regular $p$-gons, $q$ of which meet at each vertex.  The [[Platonic solid]]s correspond to:
 +
* [[tetrahedron]]: $\{3,3\}$;
 +
* [[cube]]: $\{4,3\}$;
 +
* [[octahedron]]: $\{3,4\}$;
 +
* [[dodecahedron]]: $\{5,3\}$;
 +
* [[icosahedron]]: $\{3,5\}$.
 +
There are three plane [[tessellation]]s: $\{3,6\}$, $\{4,4\}$, $\{6,3\}$.  The dual solid or tessellation to $\{p,q\}$ is $\{q,p\}$.
 +
 +
The symbol $\{p,q,r\}$ denotes a [[polytope]] in four dimensions or a [[honeycomb]].
 +
 +
====References====
 +
* H.S.M. Coxeter,  "Regular complex polytopes" , Cambridge Univ. Press  (1974) ISBN 0-521-20125-X  {{ZBL|0732.51002}}

Revision as of 18:32, 15 December 2017

Honeycomb

"A symmetrical subdivision of a three-dimensional manifold into a number of polyhedral cells all alike, each rotation that is a symmetry of a cell being also a symmetry of the entire configuration."

A regular honeycomb is described by a Schläfli symbol $\{p,q,r\}$ denoting polyhedral cells that are Platonic solids $\{p,q\}$, such that every face $\{p\}$ belongs to just two cells, and every edge to $r$ cells.

References

  • H.S.M. Coxeter "Twisted honeycombs", Conference Board of the Mathematical Sciences. Regional Conference Series in Mathematics. No.4. American Mathematical Society (1970) ISBN 0-8218-1653-5 Zbl 0217.46502
  • H.S.M. Coxeter, "Regular complex polytopes" , Cambridge Univ. Press (1974) ISBN 0-521-20125-X Zbl 0732.51002


Schläfli symbol

A symbol encoding classes of polygons, polyhedra, polytopes and tessellations.

The symbol $\{p\}$ denotes a regular $p$-gon; the symbol $\{p,q\}$ a polyhedron with faces which are regular $p$-gons, $q$ of which meet at each vertex. The Platonic solids correspond to:

There are three plane tessellations: $\{3,6\}$, $\{4,4\}$, $\{6,3\}$. The dual solid or tessellation to $\{p,q\}$ is $\{q,p\}$.

The symbol $\{p,q,r\}$ denotes a polytope in four dimensions or a honeycomb.

References

  • H.S.M. Coxeter, "Regular complex polytopes" , Cambridge Univ. Press (1974) ISBN 0-521-20125-X Zbl 0732.51002
How to Cite This Entry:
Richard Pinch/sandbox-11. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Richard_Pinch/sandbox-11&oldid=42534