Order-6 cubic honeycomb

Order-6 cubic honeycomb

Perspective projection view
within Poincaré disk model
Type Hyperbolic regular honeycomb
Paracompact uniform honeycomb
Schläfli symbol {4,3,6}
{4,3[3]}
Coxeter diagram

Cells {4,3}
Faces square {4}
Edge figure hexagon {6}
Vertex figure
triangular tiling
Coxeter group , [4,3,6]
, [4,3[3]]
Dual Order-4 hexagonal tiling honeycomb
Properties Regular, quasiregular

The order-6 cubic honeycomb is a paracompact regular space-filling tessellation (or honeycomb) in hyperbolic 3-space. It is paracompact because it has vertex figures composed of an infinite number of facets, with all vertices as ideal points at infinity. With Schläfli symbol {4,3,6}, the honeycomb has six ideal cubes meeting along each edge. Its vertex figure is an infinite triangular tiling. Its dual is the order-4 hexagonal tiling honeycomb.

A geometric honeycomb is a space-filling of polyhedral or higher-dimensional cells, so that there are no gaps. It is an example of the more general mathematical tiling or tessellation in any number of dimensions.

Honeycombs are usually constructed in ordinary Euclidean ("flat") space, like the convex uniform honeycombs. They may also be constructed in non-Euclidean spaces, such as hyperbolic uniform honeycombs. Any finite uniform polytope can be projected to its circumsphere to form a uniform honeycomb in spherical space.

Images

edit
 
One cell viewed outside of the Poincaré sphere model
 
The order-6 cubic honeycomb is analogous to the 2D hyperbolic infinite-order square tiling, {4,∞} with square faces. All vertices are on the ideal surface.

Symmetry

edit

A half-symmetry construction of the order-6 cubic honeycomb exists as {4,3[3]}, with two alternating types (colors) of cubic cells. This construction has Coxeter-Dynkin diagram             .

Another lower-symmetry construction, [4,3*,6], of index 6, exists with a non-simplex fundamental domain, with Coxeter-Dynkin diagram        .

This honeycomb contains       that tile 2-hypercycle surfaces, similar to the paracompact order-3 apeirogonal tiling,      :

 
edit

The order-6 cubic honeycomb is a regular hyperbolic honeycomb in 3-space, and one of 11 which are paracompact.

11 paracompact regular honeycombs
 
{6,3,3}
 
{6,3,4}
 
{6,3,5}
 
{6,3,6}
 
{4,4,3}
 
{4,4,4}
 
{3,3,6}
 
{4,3,6}
 
{5,3,6}
 
{3,6,3}
 
{3,4,4}

It has a related alternation honeycomb, represented by             . This alternated form has hexagonal tiling and tetrahedron cells.

There are fifteen uniform honeycombs in the [6,3,4] Coxeter group family, including the order-6 cubic honeycomb itself.

[6,3,4] family honeycombs
{6,3,4} r{6,3,4} t{6,3,4} rr{6,3,4} t0,3{6,3,4} tr{6,3,4} t0,1,3{6,3,4} t0,1,2,3{6,3,4}
               
             
{4,3,6} r{4,3,6} t{4,3,6} rr{4,3,6} 2t{4,3,6} tr{4,3,6} t0,1,3{4,3,6} t0,1,2,3{4,3,6}

The order-6 cubic honeycomb is part of a sequence of regular polychora and honeycombs with cubic cells.

{4,3,p} regular honeycombs
Space S3 E3 H3
Form Finite Affine Compact Paracompact Noncompact
Name
       
{4,3,3}
       
{4,3,4}
       
     
        
{4,3,5}
       
{4,3,6}
       
     
       
{4,3,7}
       
{4,3,8}
       
      
... {4,3,∞}
       
      
Image              
Vertex
figure

     
 
{3,3}
     
 
{3,4}
     
   
 
{3,5}
     
 
{3,6}
     
   
 
{3,7}
     
 
{3,8}
     
    
 
{3,∞}
     
    

It is also part of a sequence of honeycombs with triangular tiling vertex figures.

Hyperbolic uniform honeycombs: {p,3,6}
Form Paracompact Noncompact
Name {3,3,6} {4,3,6} {5,3,6} {6,3,6} {7,3,6} {8,3,6} ... {∞,3,6}
Image              
Cells  
{3,3}
 
{4,3}
 
{5,3}
 
{6,3}
 
{7,3}
 
{8,3}
 
{∞,3}

Rectified order-6 cubic honeycomb

edit
Rectified order-6 cubic honeycomb
Type Paracompact uniform honeycomb
Schläfli symbols r{4,3,6} or t1{4,3,6}
Coxeter diagrams        
            
            
            
Cells r{3,4}  
{3,6}  
Faces triangle {3}
square {4}
Vertex figure  
hexagonal prism
Coxeter groups  , [4,3,6]
 , [6,31,1]
 , [4,3[3]]
 , [3[]×[]]
Properties Vertex-transitive, edge-transitive

The rectified order-6 cubic honeycomb, r{4,3,6},         has cuboctahedral and triangular tiling facets, with a hexagonal prism vertex figure.

 

It is similar to the 2D hyperbolic tetraapeirogonal tiling, r{4,∞},       alternating apeirogonal and square faces:

 
r{p,3,6}
Space H3
Form Paracompact Noncompact
Name r{3,3,6}
       
r{4,3,6}
       
r{5,3,6}
       
r{6,3,6}
       
r{7,3,6}
       
... r{∞,3,6}
       
Image        
Cells
 
{3,6}
     
 
r{3,3}
     
 
r{4,3}
     
 
r{5,3}
     
 
r{6,3}
     
 
r{7,3}
     
 
r{∞,3}
     

Truncated order-6 cubic honeycomb

edit
Truncated order-6 cubic honeycomb
Type Paracompact uniform honeycomb
Schläfli symbols t{4,3,6} or t0,1{4,3,6}
Coxeter diagrams        
            
Cells t{4,3}  
{3,6}  
Faces triangle {3}
octagon {8}
Vertex figure  
hexagonal pyramid
Coxeter groups  , [4,3,6]
 , [4,3[3]]
Properties Vertex-transitive

The truncated order-6 cubic honeycomb, t{4,3,6},         has truncated cube and triangular tiling facets, with a hexagonal pyramid vertex figure.

 

It is similar to the 2D hyperbolic truncated infinite-order square tiling, t{4,∞},       with apeirogonal and octagonal (truncated square) faces:

 

Bitruncated order-6 cubic honeycomb

edit

The bitruncated order-6 cubic honeycomb is the same as the bitruncated order-4 hexagonal tiling honeycomb.

Cantellated order-6 cubic honeycomb

edit
Cantellated order-6 cubic honeycomb
Type Paracompact uniform honeycomb
Schläfli symbols rr{4,3,6} or t0,2{4,3,6}
Coxeter diagrams        
            
Cells rr{4,3}  
r{3,6}  
{}x{6}  
Faces triangle {3}
square {4}
hexagon {6}
Vertex figure  
wedge
Coxeter groups  , [4,3,6]
 , [4,3[3]]
Properties Vertex-transitive

The cantellated order-6 cubic honeycomb, rr{4,3,6},         has rhombicuboctahedron, trihexagonal tiling, and hexagonal prism facets, with a wedge vertex figure.

 

Cantitruncated order-6 cubic honeycomb

edit
Cantitruncated order-6 cubic honeycomb
Type Paracompact uniform honeycomb
Schläfli symbols tr{4,3,6} or t0,1,2{4,3,6}
Coxeter diagrams        
            
Cells tr{4,3}  
t{3,6}  
{}x{6}  
Faces square {4}
hexagon {6}
octagon {8}
Vertex figure  
mirrored sphenoid
Coxeter groups  , [4,3,6]
 , [4,3[3]]
Properties Vertex-transitive

The cantitruncated order-6 cubic honeycomb, tr{4,3,6},         has truncated cuboctahedron, hexagonal tiling, and hexagonal prism facets, with a mirrored sphenoid vertex figure.

 

Runcinated order-6 cubic honeycomb

edit

The runcinated order-6 cubic honeycomb is the same as the runcinated order-4 hexagonal tiling honeycomb.

Runcitruncated order-6 cubic honeycomb

edit
Cantellated order-6 cubic honeycomb
Type Paracompact uniform honeycomb
Schläfli symbols t0,1,3{4,3,6}
Coxeter diagrams        
Cells t{4,3}  
rr{3,6}  
{}x{6}  
{}x{8}  
Faces triangle {3}
square {4}
hexagon {6}
octagon {8}
Vertex figure  
isosceles-trapezoidal pyramid
Coxeter groups  , [4,3,6]
Properties Vertex-transitive

The runcitruncated order-6 cubic honeycomb, rr{4,3,6},         has truncated cube, rhombitrihexagonal tiling, hexagonal prism, and octagonal prism facets, with an isosceles-trapezoidal pyramid vertex figure.

 

Runcicantellated order-6 cubic honeycomb

edit

The runcicantellated order-6 cubic honeycomb is the same as the runcitruncated order-4 hexagonal tiling honeycomb.

Omnitruncated order-6 cubic honeycomb

edit

The omnitruncated order-6 cubic honeycomb is the same as the omnitruncated order-4 hexagonal tiling honeycomb.

Alternated order-6 cubic honeycomb

edit
Alternated order-6 cubic honeycomb
Type Paracompact uniform honeycomb
Semiregular honeycomb
Schläfli symbol h{4,3,6}
Coxeter diagram             
                 
              
Cells {3,3}  
{3,6}  
Faces triangle {3}
Vertex figure  
trihexagonal tiling
Coxeter group  , [6,31,1]
 , [3[]x[]]
Properties Vertex-transitive, edge-transitive, quasiregular

In three-dimensional hyperbolic geometry, the alternated order-6 hexagonal tiling honeycomb is a uniform compact space-filling tessellation (or honeycomb). As an alternation, with Schläfli symbol h{4,3,6} and Coxeter-Dynkin diagram         or      , it can be considered a quasiregular honeycomb, alternating triangular tilings and tetrahedra around each vertex in a trihexagonal tiling vertex figure.

Symmetry

edit

A half-symmetry construction from the form {4,3[3]} exists, with two alternating types (colors) of triangular tiling cells. This form has Coxeter-Dynkin diagram             . Another lower-symmetry form of index 6, [4,3*,6], exists with a non-simplex fundamental domain, with Coxeter-Dynkin diagram        .

edit

The alternated order-6 cubic honeycomb is part of a series of quasiregular polychora and honeycombs.

Quasiregular polychora and honeycombs: h{4,p,q}
Space Finite Affine Compact Paracompact
Schläfli
symbol
h{4,3,3} h{4,3,4} h{4,3,5} h{4,3,6} h{4,4,3} h{4,4,4}
           
Coxeter
diagram
                                                                             
                                                 
Image        
Vertex
figure

r{p,3}
 
     
 
     
 
     
 
     
 
     
 
     

It also has 3 related forms: the cantic order-6 cubic honeycomb, h2{4,3,6},        ; the runcic order-6 cubic honeycomb, h3{4,3,6},        ; and the runcicantic order-6 cubic honeycomb, h2,3{4,3,6},        .

Cantic order-6 cubic honeycomb

edit
Cantic order-6 cubic honeycomb
Type Paracompact uniform honeycomb
Schläfli symbol h2{4,3,6}
Coxeter diagram             
                 
Cells t{3,3}  
r{6,3}  
t{3,6}  
Faces triangle {3}
hexagon {6}
Vertex figure  
rectangular pyramid
Coxeter group  , [6,31,1]
 , [3[]x[]]
Properties Vertex-transitive

The cantic order-6 cubic honeycomb is a uniform compact space-filling tessellation (or honeycomb) with Schläfli symbol h2{4,3,6}. It is composed of truncated tetrahedron, trihexagonal tiling, and hexagonal tiling facets, with a rectangular pyramid vertex figure.

Runcic order-6 cubic honeycomb

edit
Runcic order-6 cubic honeycomb
Type Paracompact uniform honeycomb
Schläfli symbol h3{4,3,6}
Coxeter diagram             
Cells {3,3}  
{6,3}  
rr{6,3}  
Faces triangle {3}
square {4}
hexagon {6}
Vertex figure  
triangular cupola
Coxeter group  , [6,31,1]
Properties Vertex-transitive

The runcic order-6 cubic honeycomb is a uniform compact space-filling tessellation (or honeycomb) with Schläfli symbol h3{4,3,6}. It is composed of tetrahedron, hexagonal tiling, and rhombitrihexagonal tiling facets, with a triangular cupola vertex figure.

Runcicantic order-6 cubic honeycomb

edit
Runcicantic order-6 cubic honeycomb
Type Paracompact uniform honeycomb
Schläfli symbol h2,3{4,3,6}
Coxeter diagram             
Cells t{6,3}  
tr{6,3}  
t{3,3}  
Faces triangle {3}
square {4}
hexagon {6}
dodecagon {12}
Vertex figure  
mirrored sphenoid
Coxeter group  , [6,31,1]
Properties Vertex-transitive

The runcicantic order-6 cubic honeycomb is a uniform compact space-filling tessellation (or honeycomb), with Schläfli symbol h2,3{4,3,6}. It is composed of truncated hexagonal tiling, truncated trihexagonal tiling, and truncated tetrahedron facets, with a mirrored sphenoid vertex figure.

See also

edit

References

edit
  • Coxeter, Regular Polytopes, 3rd. ed., Dover Publications, 1973. ISBN 0-486-61480-8. (Tables I and II: Regular polytopes and honeycombs, pp. 294–296)
  • The Beauty of Geometry: Twelve Essays (1999), Dover Publications, LCCN 99-35678, ISBN 0-486-40919-8 (Chapter 10, Regular Honeycombs in Hyperbolic Space) Table III
  • Jeffrey R. Weeks The Shape of Space, 2nd edition ISBN 0-8247-0709-5 (Chapter 16-17: Geometries on Three-manifolds I, II)
  • Norman Johnson Uniform Polytopes, Manuscript
    • N.W. Johnson: The Theory of Uniform Polytopes and Honeycombs, Ph.D. Dissertation, University of Toronto, 1966
    • N.W. Johnson: Geometries and Transformations, (2018) Chapter 13: Hyperbolic Coxeter groups