Abstract group 128.930: $C_4^2.D_4$

• Label: 128.930
• Order: \( 2^{7} \)
• Exponent: \( 2^{3} \)
• Nilpotent: yes
• Solvable: yes
• $\card{G^{\mathrm{ab}}}$: \( 2^{3} \)
• $\card{Z(G)}$: \( 2 \)
• $\card{\Aut(G)}$: \( 2^{9} \)
• $\card{\mathrm{Out}(G)}$: \( 2^{3} \)
• Perm deg.: $16$
• Trans deg.: $16$
• Rank: $3$

Group information

Description:	$C_4^2.D_4$
Order:	\(128\)\(\medspace = 2^{7} \)
Exponent:	\(8\)\(\medspace = 2^{3} \)
Automorphism group:	$C_2^6:D_4$, of order \(512\)\(\medspace = 2^{9} \)
Composition factors:	$C_2$ x 7
Nilpotency class:	$4$
Derived length:	$3$

This group is nonabelian and a $p$-group (hence nilpotent, solvable, supersolvable, monomial, elementary, and hyperelementary).

Group statistics

Order	1	2	4	8
Elements	1	27	84	16	128
Conjugacy classes	1	6	12	1	20
Divisions	1	6	10	1	18
Autjugacy classes	1	5	6	1	13

Dimension	1	2	4	8
Irr. complex chars.	8	6	6	0	20
Irr. rational chars.	8	6	2	2	18

Minimal presentations

Permutation degree:	$16$
Transitive degree:	$16$
Rank:	$3$
Inequivalent generating triples:	$1344$

Minimal degrees of faithful linear representations

	Over $\mathbb{C}$	Over $\mathbb{R}$	Over $\mathbb{Q}$
Irreducible	4	8	8
Arbitrary	4	8	8

Constructions

Presentation:	$\langle a, b, c, d \mid b^{4}=c^{4}=d^{4}=[a,d]=[c,d]=1, a^{2}=c^{2}, b^{a}=b^{3}c^{2}, c^{a}=c^{3}d^{2}, c^{b}=cd^{2}, d^{b}=c^{3}d^{3} \rangle$
Permutation group:	Degree $16$ $\langle(1,9)(2,10)(3,11)(4,12)(5,13)(6,14)(7,15)(8,16), (1,8,2,7)(3,5,4,6)(9,12,10,11) \!\cdots\! \rangle$
Matrix group:	$\left\langle \left(\begin{array}{rrrr} 4 & 0 & 0 & 0 \\ 0 & 4 & 0 & 0 \\ 0 & 0 & 4 & 0 \\ 0 & 0 & 0 & 4 \end{array}\right), \left(\begin{array}{rrrr} 1 & 0 & 0 & 0 \\ 4 & 1 & 4 & 2 \\ 0 & 3 & 0 & 3 \\ 1 & 4 & 3 & 3 \end{array}\right), \left(\begin{array}{rrrr} 2 & 0 & 0 & 0 \\ 4 & 1 & 1 & 1 \\ 3 & 3 & 4 & 2 \\ 0 & 0 & 0 & 2 \end{array}\right), \left(\begin{array}{rrrr} 4 & 0 & 0 & 0 \\ 1 & 3 & 3 & 3 \\ 1 & 4 & 2 & 1 \\ 0 & 0 & 0 & 1 \end{array}\right), \left(\begin{array}{rrrr} 1 & 0 & 0 & 0 \\ 1 & 4 & 0 & 0 \\ 3 & 0 & 4 & 3 \\ 0 & 0 & 0 & 1 \end{array}\right), \left(\begin{array}{rrrr} 2 & 3 & 1 & 4 \\ 4 & 2 & 2 & 2 \\ 0 & 1 & 4 & 3 \\ 2 & 3 & 2 & 2 \end{array}\right), \left(\begin{array}{rrrr} 3 & 3 & 2 & 2 \\ 0 & 1 & 0 & 0 \\ 1 & 4 & 2 & 3 \\ 0 & 0 & 0 & 4 \end{array}\right) \right\rangle \subseteq \GL_{4}(\F_{5})$
Transitive group:	16T344	16T380	32T786	32T787	all 8
Direct product:	not isomorphic to a non-trivial direct product
Semidirect product:	$(C_2^3.D_4)$ $\,\rtimes\,$ $C_2$ (2)	$(C_2^3.D_4)$ $\,\rtimes\,$ $C_2$ (2)	$(C_4^2:C_4)$ $\,\rtimes\,$ $C_2$	$(C_4^2.C_2^2)$ $\,\rtimes\,$ $C_2$	more information
Trans. wreath product:	not isomorphic to a non-trivial transitive wreath product
Non-split product:	$C_4^2$ . $D_4$	$(D_4:D_4)$ . $C_2$	$(C_2\times D_4)$ . $D_4$	$(C_4:D_4)$ . $C_2^2$	all 15

Elements of the group are displayed as words in the presentation generators from the presentation above.

Homology

Abelianization:	$C_{2}^{3} $
Schur multiplier:	$C_{2}^{3}$
Commutator length:	$1$

Subgroups

There are 336 subgroups in 123 conjugacy classes, 28 normal (14 characteristic).

Characteristic subgroups are shown in this color. Normal (but not characteristic) subgroups are shown in this color.

Special subgroups

Center:	$Z \simeq$ $C_2$	$G/Z \simeq$ $C_2\wr C_2^2$
Commutator:	$G' \simeq$ $C_2\times D_4$	$G/G' \simeq$ $C_2^3$
Frattini:	$\Phi \simeq$ $C_2\times D_4$	$G/\Phi \simeq$ $C_2^3$
Fitting:	$\operatorname{Fit} \simeq$ $C_4^2.D_4$	$G/\operatorname{Fit} \simeq$ $C_1$
Radical:	$R \simeq$ $C_4^2.D_4$	$G/R \simeq$ $C_1$
Socle:	$\operatorname{soc} \simeq$ $C_2$	$G/\operatorname{soc} \simeq$ $C_2\wr C_2^2$
2-Sylow subgroup:	$P_{ 2 } \simeq$ $C_4^2.D_4$

Hi

Subgroup diagram and profile

Classes of subgroups up to conjugation

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Classes of subgroups up to automorphism

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Normal subgroups

Normal subgroups up to automorphism

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Subgroup information Click on a subgroup in the diagram to see information about it.

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Classes of subgroups up to conjugation

Order 128: $C_4^2.D_4$

Order 64: $C_2^3.D_4$ x 2, $C_2^3.D_4$ x 2, $C_4^2:C_4$, $C_4^2.C_2^2$, $D_4:D_4$

Order 32: $C_2^2.D_4$ x 5, $C_2^3:C_4$ x 4, $C_4^2:C_2$ x 2, $C_4\times D_4$ x 2, $\OD_{16}:C_2$, $D_4:C_2^2$, $D_8:C_2$, $C_4:D_4$, $C_4\times Q_8$, $C_4\wr C_2$

Order 16: $C_2^2:C_4$ x 11, $C_2\times D_4$ x 7, $C_4:C_4$ x 5, $C_4^2$ x 3, $C_2^2\times C_4$ x 3, $D_4:C_2$ x 2, $\SD_{16}$, $D_8$, $\OD_{16}$, $C_2\times Q_8$

Order 8: $C_2\times C_4$ x 14, $D_4$ x 10, $C_2^3$ x 5, $Q_8$ x 3, $C_8$

Order 4: $C_2^2$ x 11, $C_4$ x 10

Order 2: $C_2$ x 6

Order 1: $C_1$

Classes of subgroups up to automorphism

Order 128: $C_4^2.D_4$

Order 64: $C_4^2:C_4$, $C_2^3.D_4$, $C_4^2.C_2^2$, $C_2^3.D_4$, $D_4:D_4$

Order 32: $C_2^2.D_4$ x 3, $C_2^3:C_4$ x 2, $\OD_{16}:C_2$, $D_4:C_2^2$, $D_8:C_2$, $C_4:D_4$, $C_4^2:C_2$, $C_4\times Q_8$, $C_4\times D_4$, $C_4\wr C_2$

Order 16: $C_2^2:C_4$ x 6, $C_2\times D_4$ x 5, $C_4:C_4$ x 3, $C_4^2$ x 2, $D_4:C_2$ x 2, $C_2^2\times C_4$ x 2, $\SD_{16}$, $D_8$, $\OD_{16}$, $C_2\times Q_8$

Order 8: $C_2\times C_4$ x 9, $D_4$ x 6, $C_2^3$ x 3, $Q_8$ x 2, $C_8$

Order 4: $C_2^2$ x 7, $C_4$ x 6

Order 2: $C_2$ x 5

Order 1: $C_1$

Normal subgroups (quotient in parentheses)

Order 128: $C_4^2.D_4$ ($C_1$)

Order 64: $C_2^3.D_4$ ($C_2$) x 2, $C_2^3.D_4$ ($C_2$) x 2, $C_4^2:C_4$ ($C_2$), $C_4^2.C_2^2$ ($C_2$), $D_4:D_4$ ($C_2$)

Order 32: $C_2^3:C_4$ ($C_2^2$) x 2, $C_2^2.D_4$ ($C_2^2$) x 2, $\OD_{16}:C_2$ ($C_2^2$), $D_4:C_2^2$ ($C_2^2$), $C_4:D_4$ ($C_2^2$)

Order 16: $C_2^2:C_4$ ($D_4$) x 2, $C_2^2\times C_4$ ($D_4$) x 2, $C_4^2$ ($D_4$), $C_2\times D_4$ ($C_2^3$), $C_2\times D_4$ ($D_4$)

Order 8: $C_2^3$ ($C_2\times D_4$) x 2, $C_2\times C_4$ ($C_2\times D_4$)

Order 4: $C_2^2$ ($C_2^2\wr C_2$)

Order 2: $C_2$ ($C_2\wr C_2^2$)

Order 1: $C_1$ ($C_4^2.D_4$)

Normal subgroups up to automorphism (quotient in parentheses)

Order 128: $C_4^2.D_4$ ($C_1$)

Order 64: $C_4^2:C_4$ ($C_2$), $C_2^3.D_4$ ($C_2$), $C_4^2.C_2^2$ ($C_2$), $C_2^3.D_4$ ($C_2$), $D_4:D_4$ ($C_2$)

Order 32: $\OD_{16}:C_2$ ($C_2^2$), $C_2^3:C_4$ ($C_2^2$), $D_4:C_2^2$ ($C_2^2$), $C_4:D_4$ ($C_2^2$), $C_2^2.D_4$ ($C_2^2$)

Order 16: $C_2^2:C_4$ ($D_4$), $C_4^2$ ($D_4$), $C_2\times D_4$ ($C_2^3$), $C_2\times D_4$ ($D_4$), $C_2^2\times C_4$ ($D_4$)

Order 8: $C_2^3$ ($C_2\times D_4$), $C_2\times C_4$ ($C_2\times D_4$)

Order 4: $C_2^2$ ($C_2^2\wr C_2$)

Order 2: $C_2$ ($C_2\wr C_2^2$)

Order 1: $C_1$ ($C_4^2.D_4$)

Series

Derived series

$C_4^2.D_4$

$\rhd$

$C_2\times D_4$

$\rhd$

$C_2$

$\rhd$

$C_1$

Chief series

$C_4^2.D_4$

$\rhd$

$C_4^2:C_4$

$\rhd$

$C_4:D_4$

$\rhd$

$C_2\times D_4$

$\rhd$

$C_2\times C_4$

$\rhd$

$C_2^2$

$\rhd$

$C_2$

$\rhd$

$C_1$

Lower central series

$C_4^2.D_4$

$\rhd$

$C_2\times D_4$

$\rhd$

$C_2^2$

$\rhd$

$C_2$

$\rhd$

$C_1$

Upper central series

$C_1$

$\lhd$

$C_2$

$\lhd$

$C_2^2$

$\lhd$

$C_2\times D_4$

$\lhd$

$C_4^2.D_4$

Supergroups

This group is a maximal subgroup of 17 larger groups in the database.

This group is a maximal quotient of 50 larger groups in the database.

Character theory

Complex character table

See the $20 \times 20$ character table. Alternatively, you may search for characters of this group with desired properties.

Rational character table

See the $18 \times 18$ rational character table.