Abstract group 128.901: $C_{16}:D_4$

• Label: 128.901
• Order: \( 2^{7} \)
• Exponent: \( 2^{4} \)
• Nilpotent: yes
• Solvable: yes
• $\card{G^{\mathrm{ab}}}$: \( 2^{5} \)
• $\card{Z(G)}$: \( 2^{4} \)
• $\card{\Aut(G)}$: \( 2^{9} \)
• $\card{\mathrm{Out}(G)}$: \( 2^{6} \)
• Perm deg.: $20$
• Trans deg.: $64$
• Rank: $3$

Group information

Description:	$C_{16}:D_4$
Order:	\(128\)\(\medspace = 2^{7} \)
Exponent:	\(16\)\(\medspace = 2^{4} \)
Automorphism group:	$C_2^3.C_2^6$, of order \(512\)\(\medspace = 2^{9} \)
Composition factors:	$C_2$ x 7
Nilpotency class:	$2$
Derived length:	$2$

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

Group statistics

Order	1	2	4	8	16
Elements	1	11	20	32	64	128
Conjugacy classes	1	5	10	16	24	56
Divisions	1	5	7	5	5	23
Autjugacy classes	1	4	5	4	3	17

Dimension	1	2	4	8	16
Irr. complex chars.	32	24	0	0	0	56
Irr. rational chars.	8	6	5	3	1	23

Minimal presentations

Permutation degree:	$20$
Transitive degree:	$64$
Rank:	$3$
Inequivalent generating triples:	$1344$

Minimal degrees of faithful linear representations

	Over $\mathbb{C}$	Over $\mathbb{R}$	Over $\mathbb{Q}$
Irreducible	none	none	none
Arbitrary	4	6	10

Constructions

Presentation:	$\langle a, b, c \mid a^{2}=b^{4}=c^{16}=[b,c]=1, b^{a}=b^{3}c^{8}, c^{a}=c^{9} \rangle$
Permutation group:	Degree $20$ $\langle(1,2,5,9,6,3,10,12,4,7,13,15,14,11,8,16)(18,20), (2,7)(3,11)(9,15)(12,16) \!\cdots\! \rangle$
Matrix group:	$\left\langle \left(\begin{array}{rr} 19 & 18 \\ 16 & 31 \end{array}\right), \left(\begin{array}{rr} 17 & 8 \\ 0 & 1 \end{array}\right), \left(\begin{array}{rr} 9 & 4 \\ 0 & 1 \end{array}\right), \left(\begin{array}{rr} 9 & 16 \\ 16 & 25 \end{array}\right), \left(\begin{array}{rr} 1 & 16 \\ 0 & 1 \end{array}\right), \left(\begin{array}{rr} 1 & 27 \\ 24 & 27 \end{array}\right), \left(\begin{array}{rr} 17 & 0 \\ 0 & 17 \end{array}\right) \right\rangle \subseteq \GL_{2}(\Z/32\Z)$
	$\left\langle \left(\begin{array}{rr} 1 & 6 \\ 0 & 1 \end{array}\right), \left(\begin{array}{rr} 17 & 16 \\ 16 & 1 \end{array}\right), \left(\begin{array}{rr} 1 & 24 \\ 0 & 1 \end{array}\right), \left(\begin{array}{rr} 17 & 0 \\ 0 & 17 \end{array}\right), \left(\begin{array}{rr} 31 & 6 \\ 32 & 23 \end{array}\right), \left(\begin{array}{rr} 1 & 12 \\ 0 & 1 \end{array}\right), \left(\begin{array}{rr} 23 & 45 \\ 0 & 23 \end{array}\right) \right\rangle \subseteq \GL_{2}(\Z/48\Z)$
Direct product:	not isomorphic to a non-trivial direct product
Semidirect product:	$C_{16}$ $\,\rtimes\,$ $D_4$ (2)	$C_4$ $\,\rtimes\,$ $\OD_{32}$ (2)	$(C_4\times C_{16})$ $\,\rtimes\,$ $C_2$	$(C_4:C_{16})$ $\,\rtimes\,$ $C_2$	all 6
Trans. wreath product:	not isomorphic to a non-trivial transitive wreath product
Non-split product:	$(C_8\times D_4)$ . $C_2$	$(C_4\times D_4)$ . $C_4$	$(C_2\times D_4)$ . $C_8$	$C_8$ . $(C_2\times D_4)$	all 25

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

Homology

Abelianization:	$C_{2}^{2} \times C_{8} $
Schur multiplier:	$C_{2}^{2}$
Commutator length:	$1$

Subgroups

There are 116 subgroups in 81 conjugacy classes, 50 normal (26 characteristic).

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

Special subgroups

Center:	$Z \simeq$ $C_2\times C_8$	$G/Z \simeq$ $C_2^3$
Commutator:	$G' \simeq$ $C_2^2$	$G/G' \simeq$ $C_2^2\times C_8$
Frattini:	$\Phi \simeq$ $C_2\times C_8$	$G/\Phi \simeq$ $C_2^3$
Fitting:	$\operatorname{Fit} \simeq$ $C_{16}:D_4$	$G/\operatorname{Fit} \simeq$ $C_1$
Radical:	$R \simeq$ $C_{16}:D_4$	$G/R \simeq$ $C_1$
Socle:	$\operatorname{soc} \simeq$ $C_2^2$	$G/\operatorname{soc} \simeq$ $C_2^2\times C_8$
2-Sylow subgroup:	$P_{ 2 } \simeq$ $C_{16}:D_4$

Hi

Subgroup diagram and profile

Classes of subgroups up to conjugation

Classes of subgroups up to automorphism

Normal subgroups

Normal subgroups up to automorphism

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Subgroup information

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Classes of subgroups up to conjugation

Order 128: $C_{16}:D_4$

Order 64: $C_2^2:C_{16}$ x 2, $C_2\times \OD_{32}$ x 2, $C_4:C_{16}$, $C_4\times C_{16}$, $C_8\times D_4$

Order 32: $\OD_{32}$ x 4, $C_2\times C_{16}$ x 4, $C_2^2:C_8$ x 2, $C_2^2\times C_8$ x 2, $C_4\times C_8$, $C_4\times D_4$, $C_4:C_8$

Order 16: $C_2\times C_8$ x 8, $C_{16}$ x 5, $C_2^2:C_4$ x 2, $C_2^2\times C_4$ x 2, $C_4:C_4$, $C_4^2$, $C_2\times D_4$

Order 8: $C_2\times C_4$ x 9, $C_8$ x 5, $C_2^3$ x 2, $D_4$ x 2

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

Order 2: $C_2$ x 5

Order 1: $C_1$

Classes of subgroups up to automorphism

Order 128: $C_{16}:D_4$

Order 64: $C_4:C_{16}$, $C_2^2:C_{16}$, $C_4\times C_{16}$, $C_2\times \OD_{32}$, $C_8\times D_4$

Order 32: $C_2\times C_{16}$ x 3, $C_2^2:C_8$, $C_2^2\times C_8$, $C_4\times C_8$, $C_4\times D_4$, $\OD_{32}$, $C_4:C_8$

Order 16: $C_2\times C_8$ x 5, $C_{16}$ x 3, $C_4:C_4$, $C_2^2:C_4$, $C_4^2$, $C_2\times D_4$, $C_2^2\times C_4$

Order 8: $C_2\times C_4$ x 6, $C_8$ x 4, $C_2^3$, $D_4$

Order 4: $C_4$ x 5, $C_2^2$ x 4

Order 2: $C_2$ x 4

Order 1: $C_1$

Normal subgroups (quotient in parentheses)

Order 128: $C_{16}:D_4$ ($C_1$)

Order 64: $C_2^2:C_{16}$ ($C_2$) x 2, $C_2\times \OD_{32}$ ($C_2$) x 2, $C_4:C_{16}$ ($C_2$), $C_4\times C_{16}$ ($C_2$), $C_8\times D_4$ ($C_2$)

Order 32: $C_2\times C_{16}$ ($C_2^2$) x 4, $C_2^2:C_8$ ($C_4$) x 2, $C_2^2\times C_8$ ($C_2^2$) x 2, $C_4\times C_8$ ($C_2^2$), $C_4\times D_4$ ($C_4$), $C_4:C_8$ ($C_4$)

Order 16: $C_2\times C_8$ ($C_2\times C_4$) x 3, $C_2^2:C_4$ ($C_8$) x 2, $C_2^2\times C_4$ ($C_2\times C_4$) x 2, $C_{16}$ ($D_4$) x 2, $C_2\times C_8$ ($C_2^3$), $C_4:C_4$ ($C_8$), $C_4^2$ ($C_2\times C_4$), $C_2\times D_4$ ($C_8$)

Order 8: $C_2\times C_4$ ($C_2\times C_8$) x 4, $C_2^3$ ($C_2\times C_8$) x 2, $C_2\times C_4$ ($C_2^2\times C_4$), $C_8$ ($D_4:C_2$), $C_8$ ($C_2\times D_4$)

Order 4: $C_4$ ($\OD_{32}$) x 2, $C_2^2$ ($C_2^2\times C_8$), $C_4$ ($\OD_{16}:C_2$), $C_4$ ($C_4\times D_4$)

Order 2: $C_2$ ($\OD_{32}:C_2$), $C_2$ ($C_2\times \OD_{32}$), $C_2$ ($C_8\times D_4$)

Order 1: $C_1$ ($C_{16}:D_4$)

Normal subgroups up to automorphism (quotient in parentheses)

Order 128: $C_{16}:D_4$ ($C_1$)

Order 64: $C_4:C_{16}$ ($C_2$), $C_2^2:C_{16}$ ($C_2$), $C_4\times C_{16}$ ($C_2$), $C_2\times \OD_{32}$ ($C_2$), $C_8\times D_4$ ($C_2$)

Order 32: $C_2\times C_{16}$ ($C_2^2$) x 3, $C_2^2:C_8$ ($C_4$), $C_2^2\times C_8$ ($C_2^2$), $C_4\times C_8$ ($C_2^2$), $C_4\times D_4$ ($C_4$), $C_4:C_8$ ($C_4$)

Order 16: $C_2\times C_8$ ($C_2\times C_4$) x 2, $C_2\times C_8$ ($C_2^3$), $C_4:C_4$ ($C_8$), $C_2^2:C_4$ ($C_8$), $C_4^2$ ($C_2\times C_4$), $C_2\times D_4$ ($C_8$), $C_2^2\times C_4$ ($C_2\times C_4$), $C_{16}$ ($D_4$)

Order 8: $C_2\times C_4$ ($C_2\times C_8$) x 3, $C_2^3$ ($C_2\times C_8$), $C_2\times C_4$ ($C_2^2\times C_4$), $C_8$ ($D_4:C_2$), $C_8$ ($C_2\times D_4$)

Order 4: $C_2^2$ ($C_2^2\times C_8$), $C_4$ ($\OD_{16}:C_2$), $C_4$ ($C_4\times D_4$), $C_4$ ($\OD_{32}$)

Order 2: $C_2$ ($\OD_{32}:C_2$), $C_2$ ($C_2\times \OD_{32}$), $C_2$ ($C_8\times D_4$)

Order 1: $C_1$ ($C_{16}:D_4$)

Series

Derived series

$C_{16}:D_4$

$\rhd$

$C_2^2$

$\rhd$

$C_1$

Chief series

$C_{16}:D_4$

$\rhd$

$C_4\times C_{16}$

$\rhd$

$C_2\times C_{16}$

$\rhd$

$C_2\times C_8$

$\rhd$

$C_8$

$\rhd$

$C_4$

$\rhd$

$C_2$

$\rhd$

$C_1$

Lower central series

$C_{16}:D_4$

$\rhd$

$C_2^2$

$\rhd$

$C_1$

Upper central series

$C_1$

$\lhd$

$C_2\times C_8$

$\lhd$

$C_{16}:D_4$

Supergroups

This group is a maximal subgroup of 73 larger groups in the database.

This group is a maximal quotient of 22 larger groups in the database.

Character theory

Complex character table

See the $56 \times 56$ character table. Alternatively, you may search for characters of this group with desired properties.

Rational character table

See the $23 \times 23$ rational character table.