Part of the Atlas of Small Regular Polytopes

Polytope of Type {6,21}

Atlas Canonical Name {6,21}*1008b

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Overview

Group
SmallGroup(1008,904)
Rank
3
Schläfli Type
{6,21}
Vertices, edges, …
24, 252, 84
Order of s0s1s2
84
Order of s0s1s2s1
6
Also known as
if this polytope has a name.

Special Properties

  • Compact Hyperbolic Quotient
  • Locally Spherical
  • Orientable

Quotients maximal quotients in bold

3-fold

4-fold

7-fold

12-fold

21-fold

28-fold

36-fold

42-fold

84-fold

Covers minimal covers in bold

None in this atlas.

Irregular Quotients of which this is a minimal cover

Click an entry to reveal its facets and vertex figures.

P/N, where N=<s0*s1*s0*s2*(s1*s0)^2*s2*s1> of order 2

42 facets

12 vertex figures

P/N, where N=<(s0*s1)^2> of order 3

42 facets

8 vertex figures

P/N, where N=<(s1*s0)^2*s2*s1*s0*s1*s2> of order 4

21 facets

6 vertex figures

Representations

Permutation Representation (GAP)
s0 := ( 3, 4)( 7, 8)(11,12)(15,16)(19,20)(23,24)(27,28)(31,32)(35,36)(39,40)(43,44)(47,48)(51,52)(55,56)(59,60)(63,64)(67,68)(71,72)(75,76)(79,80)(83,84);;
s1 := ( 2, 4)( 5,25)( 6,28)( 7,27)( 8,26)( 9,21)(10,24)(11,23)(12,22)(13,17)(14,20)(15,19)(16,18)(29,57)(30,60)(31,59)(32,58)(33,81)(34,84)(35,83)(36,82)(37,77)(38,80)(39,79)(40,78)(41,73)(42,76)(43,75)(44,74)(45,69)(46,72)(47,71)(48,70)(49,65)(50,68)(51,67)(52,66)(53,61)(54,64)(55,63)(56,62);;
s2 := ( 1,34)( 2,33)( 3,35)( 4,36)( 5,30)( 6,29)( 7,31)( 8,32)( 9,54)(10,53)(11,55)(12,56)(13,50)(14,49)(15,51)(16,52)(17,46)(18,45)(19,47)(20,48)(21,42)(22,41)(23,43)(24,44)(25,38)(26,37)(27,39)(28,40)(57,62)(58,61)(59,63)(60,64)(65,82)(66,81)(67,83)(68,84)(69,78)(70,77)(71,79)(72,80)(73,74);;
poly := Group([s0,s1,s2]);;
Finitely Presented Group Representation (GAP)
F := FreeGroup("s0","s1","s2");;
s0 := F.1;;  s1 := F.2;;  s2 := F.3;;  
rels := [ s0*s0, s1*s1, s2*s2, s0*s2*s0*s2, s0*s1*s0*s1*s0*s1*s0*s1*s0*s1*s0*s1, 
s0*s1*s2*s1*s2*s1*s0*s1*s2*s1*s2*s1, 
s0*s1*s2*s0*s1*s0*s1*s2*s0*s1*s0*s1*s2*s0*s1*s0*s1*s2*s0*s1, 
s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2 ];;
poly := F / rels;;
Permutation Representation (Magma)
s0 := Sym(84)!( 3, 4)( 7, 8)(11,12)(15,16)(19,20)(23,24)(27,28)(31,32)(35,36)(39,40)(43,44)(47,48)(51,52)(55,56)(59,60)(63,64)(67,68)(71,72)(75,76)(79,80)(83,84);
s1 := Sym(84)!( 2, 4)( 5,25)( 6,28)( 7,27)( 8,26)( 9,21)(10,24)(11,23)(12,22)(13,17)(14,20)(15,19)(16,18)(29,57)(30,60)(31,59)(32,58)(33,81)(34,84)(35,83)(36,82)(37,77)(38,80)(39,79)(40,78)(41,73)(42,76)(43,75)(44,74)(45,69)(46,72)(47,71)(48,70)(49,65)(50,68)(51,67)(52,66)(53,61)(54,64)(55,63)(56,62);
s2 := Sym(84)!( 1,34)( 2,33)( 3,35)( 4,36)( 5,30)( 6,29)( 7,31)( 8,32)( 9,54)(10,53)(11,55)(12,56)(13,50)(14,49)(15,51)(16,52)(17,46)(18,45)(19,47)(20,48)(21,42)(22,41)(23,43)(24,44)(25,38)(26,37)(27,39)(28,40)(57,62)(58,61)(59,63)(60,64)(65,82)(66,81)(67,83)(68,84)(69,78)(70,77)(71,79)(72,80)(73,74);
poly := sub<Sym(84)|s0,s1,s2>;
Finitely Presented Group Representation (Magma)
poly<s0,s1,s2> := Group< s0,s1,s2 | s0*s0, s1*s1, s2*s2, 
s0*s2*s0*s2, s0*s1*s0*s1*s0*s1*s0*s1*s0*s1*s0*s1, 
s0*s1*s2*s1*s2*s1*s0*s1*s2*s1*s2*s1, 
s0*s1*s2*s0*s1*s0*s1*s2*s0*s1*s0*s1*s2*s0*s1*s0*s1*s2*s0*s1, 
s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2 >; 

References

None.

to this polytope.

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