Copied to
clipboard

G = D8:D4  order 128 = 27

The semidirect product of D8 and D4 acting via D4/C2=C22

p-group, metabelian, nilpotent (class 4), monomial

Aliases: D8:D4, Q16:D4, C23.6D8, M5(2):1C22, (C2xC4).6D8, C8:2D4:1C2, (C2xC8).11D4, C8.18(C2xD4), D8:2C4:1C2, C16:C22:1C2, C23.C8:1C2, (C2xC8).3C23, C4.Q8:1C22, C4.22C22wrC2, (C2xD8):11C22, C4oD8.3C22, C22.19(C2xD8), D8:C22:4C2, C4.97(C8:C22), (C22xC4).103D4, C2.30(C22:D8), (C2xM4(2)).35C22, (C2xC4).278(C2xD4), SmallGroup(128,922)

Series: Derived ►Chief ►Lower central ►Upper central ►Jennings

Derived series
C1 — C2xC8 — D8:D4
Chief series
C1 — C2 — C4 — C2xC4 — C2xC8 — C2xM4(2) — D8:C22 — D8:D4
Lower central
C1 — C2 — C4 — C2xC8 — D8:D4
Upper central
C1 — C2 — C2xC4 — C2xM4(2) — D8:D4
Jennings
C1 — C2 — C2 — C2 — C2 — C4 — C4 — C2xC8 — D8:D4

Generators and relations for D8:D4
 G = < a,b,c,d | a8=b2=c4=d2=1, bab=dad=a-1, cac-1=a3, cbc-1=ab, dbd=a5b, dcd=c-1 >

Subgroups: 324 in 113 conjugacy classes, 32 normal (18 characteristic)
C1, C2, C2, C4, C4, C22, C22, C8, C8, C2xC4, C2xC4, D4, Q8, C23, C23, C16, C22:C4, C4:C4, C2xC8, M4(2), D8, D8, SD16, Q16, Q16, C22xC4, C22xC4, C2xD4, C2xQ8, C4oD4, D4:C4, C4.Q8, M5(2), D16, SD32, C4:D4, C2xM4(2), C2xD8, C4oD8, C4oD8, C8:C22, C8.C22, C2xC4oD4, C23.C8, D8:2C4, C8:2D4, C16:C22, D8:C22, D8:D4
Quotients: C1, C2, C22, D4, C23, D8, C2xD4, C22wrC2, C2xD8, C8:C22, C22:D8, D8:D4

Character table of D8:D4

 class 12A2B2C2D2E2F4A4B4C4D4E4F8A8B8C16A16B16C16D
 size 1124881622488164488888
ρ111111111111111111111    trivial
ρ2111-1-11111-1-11-111-1-111-1    linear of order 2
ρ3111-1-11-111-1-11111-11-1-11    linear of order 2
ρ4111111-111111-1111-1-1-1-1    linear of order 2
ρ5111-11-1-111-11-1111-1-111-1    linear of order 2
ρ61111-1-1-1111-1-1-11111111    linear of order 2
ρ71111-1-11111-1-11111-1-1-1-1    linear of order 2
ρ8111-11-1111-11-1-111-11-1-11    linear of order 2
ρ922-20200-220-2002-200000    orthogonal lifted from D4
ρ102222000222000-2-2-20000    orthogonal lifted from D4
ρ1122-20020-2200-20-2200000    orthogonal lifted from D4
ρ12222-200022-2000-2-220000    orthogonal lifted from D4
ρ1322-20-200-2202002-200000    orthogonal lifted from D4
ρ1422-200-20-220020-2200000    orthogonal lifted from D4
ρ152222000-2-2-2000000-√2√2-√2√2    orthogonal lifted from D8
ρ16222-2000-2-22000000√2√2-√2-√2    orthogonal lifted from D8
ρ17222-2000-2-22000000-√2-√2√2√2    orthogonal lifted from D8
ρ182222000-2-2-2000000√2-√2√2-√2    orthogonal lifted from D8
ρ1944-400004-400000000000    orthogonal lifted from C8:C22
ρ208-8000000000000000000    orthogonal faithful

Permutation representations of D8:D4
►On 16 points - transitive group 16T385
Generators in S16
(1 2 3 4 5 6 7 8)(9 10 11 12 13 14 15 16)

(1 12)(2 11)(3 10)(4 9)(5 16)(6 15)(7 14)(8 13)

(1 5)(2 8)(4 6)(9 10 13 14)(11 16 15 12)

(2 8)(3 7)(4 6)(9 10)(11 16)(12 15)(13 14)
 
G:=sub<Sym(16)| (1,2,3,4,5,6,7,8)(9,10,11,12,13,14,15,16), (1,12)(2,11)(3,10)(4,9)(5,16)(6,15)(7,14)(8,13), (1,5)(2,8)(4,6)(9,10,13,14)(11,16,15,12), (2,8)(3,7)(4,6)(9,10)(11,16)(12,15)(13,14)>;
 
G:=Group( (1,2,3,4,5,6,7,8)(9,10,11,12,13,14,15,16), (1,12)(2,11)(3,10)(4,9)(5,16)(6,15)(7,14)(8,13), (1,5)(2,8)(4,6)(9,10,13,14)(11,16,15,12), (2,8)(3,7)(4,6)(9,10)(11,16)(12,15)(13,14) );
 
G=PermutationGroup([[(1,2,3,4,5,6,7,8),(9,10,11,12,13,14,15,16)], [(1,12),(2,11),(3,10),(4,9),(5,16),(6,15),(7,14),(8,13)], [(1,5),(2,8),(4,6),(9,10,13,14),(11,16,15,12)], [(2,8),(3,7),(4,6),(9,10),(11,16),(12,15),(13,14)]])
 
G:=TransitiveGroup(16,385);
 

Matrix representation of D8:D4 ►in GL8(Z)

00100000
00010000
0-1000000
10000000
00000001
000000-10
00001000
00000100
,
00000001
000000-10
00001000
00000100
00100000
00010000
0-1000000
10000000
,
10000000
0-1000000
000-10000
00-100000
00000010
0000000-1
0000-1000
00000100
,
10000000
0-1000000
00010000
00100000
00000010
0000000-1
00001000
00000-100

G:=sub<GL(8,Integers())| [0,0,0,1,0,0,0,0,0,0,-1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,-1,0,0,0,0,0,0,1,0,0,0],[0,0,0,0,0,0,0,1,0,0,0,0,0,0,-1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,-1,0,0,0,0,0,0,1,0,0,0,0,0,0,0],[1,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0,0,0,-1,0,0],[1,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,-1,0,0,0,0,1,0,0,0,0,0,0,0,0,-1,0,0] >;
 

D8:D4 in GAP, Magma, Sage, TeX 

D_8\rtimes D_4
 
% in TeX
 
G:=Group("D8:D4");
 
// GroupNames label
 
G:=SmallGroup(128,922);
 
// by ID
 
G=gap.SmallGroup(128,922);
 
# by ID
 
G:=PCGroup([7,-2,2,2,-2,2,-2,-2,141,422,1123,570,521,360,1411,4037,2028,124]);
 
// Polycyclic
 
G:=Group<a,b,c,d|a^8=b^2=c^4=d^2=1,b*a*b=d*a*d=a^-1,c*a*c^-1=a^3,c*b*c^-1=a*b,d*b*d=a^5*b,d*c*d=c^-1>;
 
// generators/relations
 

Export

Character table of D8:D4 in TeX

׿
x
:
Z
F
o
wr
Q
<