Part of the Atlas of Small Regular Polytopes

Polytope of Type {2,20,4}

Atlas Canonical Name {2,20,4}*640

Overview

Group
SmallGroup(640,12497)
Rank
4
Schläfli Type
{2,20,4}
Vertices, edges, …
2, 40, 80, 8
Order of s0s1s2s3
20
Order of s0s1s2s3s2s1
2
Also known as
if this polytope has a name.

Special Properties

  • Degenerate
  • Universal
  • Orientable
  • Flat

Quotients maximal quotients in bold

2-fold

4-fold

5-fold

8-fold

10-fold

16-fold

20-fold

40-fold

Covers minimal covers in bold

2-fold

3-fold

Representations

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