Polytope of Type {7,2,12,2}

This page is part of the Atlas of Small Regular Polytopes
Atlas Canonical Name : {7,2,12,2}*672
if this polytope has a name.
Group : SmallGroup(672,1140)
Rank : 5
Schlafli Type : {7,2,12,2}
Number of vertices, edges, etc : 7, 7, 12, 12, 2
Order of s₀s₁s₂s₃s₄ : 84
Order of s₀s₁s₂s₃s₄s₃s₂s₁ : 2
Special Properties :
   Degenerate
   Universal
   Orientable
   Flat
Related Polytopes :
   Facet
   Vertex Figure
   Dual
Facet Of :
   {7,2,12,2,2} of size 1344
Vertex Figure Of :
   {2,7,2,12,2} of size 1344
Quotients (Maximal Quotients in Boldface) :
   2-fold quotients : {7,2,6,2}*336
   3-fold quotients : {7,2,4,2}*224
   4-fold quotients : {7,2,3,2}*168
   6-fold quotients : {7,2,2,2}*112
Covers (Minimal Covers in Boldface) :
   2-fold covers : {7,2,12,4}*1344a, {7,2,24,2}*1344, {14,2,12,2}*1344
Permutation Representation (GAP) :

s0 := (2,3)(4,5)(6,7);;
s1 := (1,2)(3,4)(5,6);;
s2 := ( 9,10)(11,12)(14,17)(15,16)(18,19);;
s3 := ( 8,14)( 9,11)(10,18)(12,15)(13,16)(17,19);;
s4 := (20,21);;
poly := Group([s0,s1,s2,s3,s4]);;

Finitely Presented Group Representation (GAP) :

F := FreeGroup("s0","s1","s2","s3","s4");;
s0 := F.1;;  s1 := F.2;;  s2 := F.3;;  s3 := F.4;;  s4 := F.5;;  
rels := [ s0*s0, s1*s1, s2*s2, s3*s3, s4*s4, s0*s2*s0*s2, 
s1*s2*s1*s2, s0*s3*s0*s3, s1*s3*s1*s3, 
s0*s4*s0*s4, s1*s4*s1*s4, s2*s4*s2*s4, 
s3*s4*s3*s4, s0*s1*s0*s1*s0*s1*s0*s1*s0*s1*s0*s1*s0*s1, 
s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3 ];;
poly := F / rels;;

Permutation Representation (Magma) :

s0 := Sym(21)!(2,3)(4,5)(6,7);
s1 := Sym(21)!(1,2)(3,4)(5,6);
s2 := Sym(21)!( 9,10)(11,12)(14,17)(15,16)(18,19);
s3 := Sym(21)!( 8,14)( 9,11)(10,18)(12,15)(13,16)(17,19);
s4 := Sym(21)!(20,21);
poly := sub<Sym(21)|s0,s1,s2,s3,s4>;

Finitely Presented Group Representation (Magma) :

poly<s0,s1,s2,s3,s4> := Group< s0,s1,s2,s3,s4 | s0*s0, s1*s1, s2*s2, 
s3*s3, s4*s4, s0*s2*s0*s2, s1*s2*s1*s2, 
s0*s3*s0*s3, s1*s3*s1*s3, s0*s4*s0*s4, 
s1*s4*s1*s4, s2*s4*s2*s4, s3*s4*s3*s4, 
s0*s1*s0*s1*s0*s1*s0*s1*s0*s1*s0*s1*s0*s1, 
s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3*s2*s3 >;

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