Part of the Atlas of Small Regular Polytopes

Polytope of Type {2,6,18}

Atlas Canonical Name {2,6,18}*648a

Overview

Group
SmallGroup(648,297)
Rank
4
Schläfli Type
{2,6,18}
Vertices, edges, …
2, 9, 81, 27
Order of s0s1s2s3
18
Order of s0s1s2s3s2s1
2
Also known as
if this polytope has a name.

Special Properties

  • Degenerate
  • Universal
  • Non-Orientable
  • Flat

Quotients maximal quotients in bold

3-fold

Covers minimal covers in bold

2-fold

3-fold

Representations

Permutation Representation (GAP)
s0 := (1,2);;
s1 := ( 4, 5)( 7, 8)(10,11)(12,21)(13,23)(14,22)(15,24)(16,26)(17,25)(18,27)(19,29)(20,28)(31,32)(34,35)(37,38)(39,48)(40,50)(41,49)(42,51)(43,53)(44,52)(45,54)(46,56)(47,55)(58,59)(61,62)(64,65)(66,75)(67,77)(68,76)(69,78)(70,80)(71,79)(72,81)(73,83)(74,82);;
s2 := ( 3,12)( 4,13)( 5,14)( 6,18)( 7,19)( 8,20)( 9,15)(10,16)(11,17)(24,27)(25,28)(26,29)(30,69)(31,70)(32,71)(33,66)(34,67)(35,68)(36,72)(37,73)(38,74)(39,60)(40,61)(41,62)(42,57)(43,58)(44,59)(45,63)(46,64)(47,65)(48,78)(49,79)(50,80)(51,75)(52,76)(53,77)(54,81)(55,82)(56,83);;
s3 := ( 3,30)( 4,32)( 5,31)( 6,36)( 7,38)( 8,37)( 9,33)(10,35)(11,34)(12,40)(13,39)(14,41)(15,46)(16,45)(17,47)(18,43)(19,42)(20,44)(21,50)(22,49)(23,48)(24,56)(25,55)(26,54)(27,53)(28,52)(29,51)(57,60)(58,62)(59,61)(64,65)(66,70)(67,69)(68,71)(72,73)(75,80)(76,79)(77,78)(81,83);;
poly := Group([s0,s1,s2,s3]);;
Finitely Presented Group Representation (GAP)
F := FreeGroup("s0","s1","s2","s3");;
s0 := F.1;;  s1 := F.2;;  s2 := F.3;;  s3 := F.4;;  
rels := [ s0*s0, s1*s1, s2*s2, s3*s3, s0*s1*s0*s1, 
s0*s2*s0*s2, s0*s3*s0*s3, s1*s3*s1*s3, 
s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2, 
s1*s2*s3*s1*s2*s3*s1*s2*s1*s2*s3*s1*s2*s3*s1*s2, 
s1*s2*s3*s2*s1*s2*s3*s2*s3*s2*s1*s2*s3*s2*s1*s2, 
s2*s3*s2*s3*s2*s3*s2*s3*s2*s1*s3*s2*s1*s3*s2*s1*s3*s2*s3*s2*s3 ];;
poly := F / rels;;
Permutation Representation (Magma)
s0 := Sym(83)!(1,2);
s1 := Sym(83)!( 4, 5)( 7, 8)(10,11)(12,21)(13,23)(14,22)(15,24)(16,26)(17,25)(18,27)(19,29)(20,28)(31,32)(34,35)(37,38)(39,48)(40,50)(41,49)(42,51)(43,53)(44,52)(45,54)(46,56)(47,55)(58,59)(61,62)(64,65)(66,75)(67,77)(68,76)(69,78)(70,80)(71,79)(72,81)(73,83)(74,82);
s2 := Sym(83)!( 3,12)( 4,13)( 5,14)( 6,18)( 7,19)( 8,20)( 9,15)(10,16)(11,17)(24,27)(25,28)(26,29)(30,69)(31,70)(32,71)(33,66)(34,67)(35,68)(36,72)(37,73)(38,74)(39,60)(40,61)(41,62)(42,57)(43,58)(44,59)(45,63)(46,64)(47,65)(48,78)(49,79)(50,80)(51,75)(52,76)(53,77)(54,81)(55,82)(56,83);
s3 := Sym(83)!( 3,30)( 4,32)( 5,31)( 6,36)( 7,38)( 8,37)( 9,33)(10,35)(11,34)(12,40)(13,39)(14,41)(15,46)(16,45)(17,47)(18,43)(19,42)(20,44)(21,50)(22,49)(23,48)(24,56)(25,55)(26,54)(27,53)(28,52)(29,51)(57,60)(58,62)(59,61)(64,65)(66,70)(67,69)(68,71)(72,73)(75,80)(76,79)(77,78)(81,83);
poly := sub<Sym(83)|s0,s1,s2,s3>;
Finitely Presented Group Representation (Magma)
poly<s0,s1,s2,s3> := Group< s0,s1,s2,s3 | s0*s0, s1*s1, s2*s2, 
s3*s3, s0*s1*s0*s1, s0*s2*s0*s2, s0*s3*s0*s3, 
s1*s3*s1*s3, s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2, 
s1*s2*s3*s1*s2*s3*s1*s2*s1*s2*s3*s1*s2*s3*s1*s2, 
s1*s2*s3*s2*s1*s2*s3*s2*s3*s2*s1*s2*s3*s2*s1*s2, 
s2*s3*s2*s3*s2*s3*s2*s3*s2*s1*s3*s2*s1*s3*s2*s1*s3*s2*s3*s2*s3 >;