Abstract group 256.5615: $C_4^2:C_4^2$

• Label: 256.5615
• Order: \( 2^{8} \)
• Exponent: \( 2^{2} \)
• Nilpotent: yes
• Solvable: yes
• $\card{G^{\mathrm{ab}}}$: \( 2^{5} \)
• $\card{Z(G)}$: \( 2^{2} \)
• $\card{\Aut(G)}$: \( 2^{13} \)
• $\card{\mathrm{Out}(G)}$: \( 2^{7} \)
• Perm deg.: $20$
• Trans deg.: $64$
• Rank: $3$

Group information

Description:	$C_4^2:C_4^2$
Order:	\(256\)\(\medspace = 2^{8} \)
Exponent:	\(4\)\(\medspace = 2^{2} \)
Automorphism group:	$C_2.C_2^6.C_2^6$, of order \(8192\)\(\medspace = 2^{13} \)
Composition factors:	$C_2$ x 8
Nilpotency class:	$4$
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
Elements	1	23	232	256
Conjugacy classes	1	9	36	46
Divisions	1	9	21	31
Autjugacy classes	1	6	10	17

Dimension	1	2	4	8
Irr. complex chars.	32	8	4	2	46
Irr. rational chars.	8	16	4	3	31

Minimal presentations

Permutation degree:	$20$
Transitive degree:	$64$
Rank:	$3$
Inequivalent generating triples:	$672$

Minimal degrees of faithful linear representations

	Over $\mathbb{C}$	Over $\mathbb{R}$	Over $\mathbb{Q}$
Irreducible	none	none	none
Arbitrary	9	10	10

Constructions

Presentation:	$\langle a, b, c, d \mid a^{4}=b^{4}=c^{4}=d^{4}=[a,b]=[b,d]=[c,d]=1, c^{a}=c^{3}d, d^{a}=c^{2}d^{3}, c^{b}=cd^{2} \rangle$
Permutation group:	Degree $20$ $\langle(1,2)(3,5)(4,13)(6,16)(7,9)(8,11)(10,15)(12,14)(17,18,19,20), (1,3,6,2) \!\cdots\! \rangle$
Direct product:	not isomorphic to a non-trivial direct product
Semidirect product:	$C_4^2$ $\,\rtimes\,$ $C_4^2$ (2)	$(C_2\times Q_8)$ $\,\rtimes\,$ $C_4^2$ (2)	$(C_4^2:C_4)$ $\,\rtimes\,$ $C_4$	$(C_4^2:C_4)$ $\,\rtimes\,$ $C_4$	all 7
Trans. wreath product:	not isomorphic to a non-trivial transitive wreath product
Non-split product:	$(C_4^2.D_4)$ . $C_2$	$(C_2^4.D_4)$ . $C_2$ (2)	$(C_2^4.D_4)$ . $C_2$ (2)	$(C_2^3\times C_4)$ . $D_4$ (2)	all 32

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

Homology

Abelianization:	$C_{2} \times C_{4}^{2} $
Schur multiplier:	$C_{2}^{3} \times C_{4}$
Commutator length:	$1$

Subgroups

There are 847 subgroups in 282 conjugacy classes, 81 normal (29 characteristic).

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

Special subgroups

Center:	$Z \simeq$ $C_2^2$	$G/Z \simeq$ $C_2^4:C_4$
Commutator:	$G' \simeq$ $C_2\times C_4$	$G/G' \simeq$ $C_2\times C_4^2$
Frattini:	$\Phi \simeq$ $C_2^2\times D_4$	$G/\Phi \simeq$ $C_2^3$
Fitting:	$\operatorname{Fit} \simeq$ $C_4^2:C_4^2$	$G/\operatorname{Fit} \simeq$ $C_1$
Radical:	$R \simeq$ $C_4^2:C_4^2$	$G/R \simeq$ $C_1$
Socle:	$\operatorname{soc} \simeq$ $C_2^2$	$G/\operatorname{soc} \simeq$ $C_2^4:C_4$
2-Sylow subgroup:	$P_{ 2 } \simeq$ $C_4^2:C_4^2$

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.

Classes of subgroups up to conjugation

Order 256: $C_4^2:C_4^2$

Order 128: $C_2^4.D_4$ x 2, $C_2^3:C_4^2$ x 2, $C_2^4.D_4$ x 2, $C_4^2.D_4$

Order 64: $C_4^2:C_4$ x 8, $C_2^4:C_4$ x 4, $C_2^3.C_2^3$ x 2, $C_2^3.D_4$ x 2, $C_2^2:C_4^2$ x 2, $C_2^2.C_4^2$ x 2, $C_2^3.C_2^3$, $C_2^3.C_2^3$, $C_4^2:C_4$, $C_4^2:C_4$, $C_4^2:C_2^2$, $C_4^2.C_2^2$, $C_4^2:C_2^2$

Order 32: $C_2^3:C_4$ x 12, $C_2^3:C_4$ x 10, $C_4^2:C_2$ x 6, $C_2\times C_4^2$ x 6, $C_2.C_4^2$ x 6, $C_2^2.D_4$ x 5, $C_2^3\times C_4$ x 2, $C_4\times Q_8$ x 2, $C_4\times D_4$ x 2, $C_2^2\times Q_8$, $C_2^2\times D_4$

Order 16: $C_2^2:C_4$ x 24, $C_2^2\times C_4$ x 19, $C_4^2$ x 12, $C_4:C_4$ x 6, $C_2\times D_4$ x 6, $C_2\times Q_8$ x 5, $C_2^4$ x 2

Order 8: $C_2\times C_4$ x 49, $C_2^3$ x 13, $Q_8$ x 4, $D_4$ x 4

Order 4: $C_4$ x 21, $C_2^2$ x 19

Order 2: $C_2$ x 9

Order 1: $C_1$

Classes of subgroups up to automorphism

Order 256: $C_4^2:C_4^2$

Order 128: $C_2^4.D_4$, $C_2^3:C_4^2$, $C_2^4.D_4$, $C_4^2.D_4$

Order 64: $C_2^4:C_4$, $C_2^3.C_2^3$, $C_2^3.C_2^3$, $C_2^3.C_2^3$, $C_2^3.D_4$, $C_4^2:C_4$, $C_2^2:C_4^2$, $C_4^2:C_4$, $C_4^2:C_4$, $C_2^2.C_4^2$, $C_4^2:C_2^2$, $C_4^2.C_2^2$, $C_4^2:C_2^2$

Order 32: $C_2\times C_4^2$ x 5, $C_2^2.D_4$ x 4, $C_2^3:C_4$ x 4, $C_2.C_4^2$ x 4, $C_2^3:C_4$ x 2, $C_4^2:C_2$ x 2, $C_2^2\times Q_8$, $C_2^2\times D_4$, $C_2^3\times C_4$, $C_4\times Q_8$, $C_4\times D_4$

Order 16: $C_2^2\times C_4$ x 12, $C_4^2$ x 6, $C_2^2:C_4$ x 5, $C_4:C_4$ x 4, $C_2\times Q_8$ x 4, $C_2\times D_4$ x 4, $C_2^4$

Order 8: $C_2\times C_4$ x 26, $C_2^3$ x 6, $Q_8$ x 2, $D_4$ x 2

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

Order 2: $C_2$ x 6

Order 1: $C_1$

Normal subgroups (quotient in parentheses)

Order 256: $C_4^2:C_4^2$ ($C_1$)

Order 128: $C_2^4.D_4$ ($C_2$) x 2, $C_2^3:C_4^2$ ($C_2$) x 2, $C_2^4.D_4$ ($C_2$) x 2, $C_4^2.D_4$ ($C_2$)

Order 64: $C_4^2:C_4$ ($C_4$) x 8, $C_2^4:C_4$ ($C_2^2$) x 4, $C_2^3.C_2^3$ ($C_4$), $C_2^3.C_2^3$ ($C_2^2$), $C_4^2:C_4$ ($C_4$), $C_4^2:C_4$ ($C_4$), $C_4^2:C_2^2$ ($C_2^2$), $C_4^2.C_2^2$ ($C_4$), $C_4^2:C_2^2$ ($C_2^2$)

Order 32: $C_2^3:C_4$ ($C_2\times C_4$) x 8, $C_4^2:C_2$ ($C_2\times C_4$) x 4, $C_2\times C_4^2$ ($C_2\times C_4$) x 3, $C_2^3\times C_4$ ($D_4$) x 2, $C_2^2.D_4$ ($C_2\times C_4$) x 2, $C_2^3:C_4$ ($D_4$) x 2, $C_2^2\times Q_8$ ($C_2\times C_4$), $C_2^2\times D_4$ ($C_2^3$)

Order 16: $C_2^2\times C_4$ ($C_2^2:C_4$) x 4, $C_4^2$ ($C_4^2$) x 2, $C_2^4$ ($C_2\times D_4$) x 2, $C_2\times Q_8$ ($C_4^2$) x 2, $C_2\times D_4$ ($D_4:C_2$) x 2, $C_2\times D_4$ ($C_2^2\times C_4$) x 2, $C_2^2\times C_4$ ($C_2^2\times C_4$)

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

Order 4: $C_2^2$ ($C_2^3.C_2^3$), $C_2^2$ ($C_2^4:C_4$), $C_2^2$ ($C_2^2:C_4^2$)

Order 2: $C_2$ ($(C_2^2\times Q_8):C_4$), $C_2$ ($C_2^4.D_4$), $C_2$ ($C_2^3:C_4^2$)

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

Normal subgroups up to automorphism (quotient in parentheses)

Order 256: $C_4^2:C_4^2$ ($C_1$)

Order 128: $C_2^4.D_4$ ($C_2$), $C_2^3:C_4^2$ ($C_2$), $C_2^4.D_4$ ($C_2$), $C_4^2.D_4$ ($C_2$)

Order 64: $C_2^4:C_4$ ($C_2^2$), $C_2^3.C_2^3$ ($C_4$), $C_2^3.C_2^3$ ($C_2^2$), $C_4^2:C_4$ ($C_4$), $C_4^2:C_4$ ($C_4$), $C_4^2:C_4$ ($C_4$), $C_4^2:C_2^2$ ($C_2^2$), $C_4^2.C_2^2$ ($C_4$), $C_4^2:C_2^2$ ($C_2^2$)

Order 32: $C_2\times C_4^2$ ($C_2\times C_4$) x 3, $C_2^2.D_4$ ($C_2\times C_4$) x 2, $C_2^3:C_4$ ($C_2\times C_4$), $C_2^2\times Q_8$ ($C_2\times C_4$), $C_2^2\times D_4$ ($C_2^3$), $C_2^3\times C_4$ ($D_4$), $C_4^2:C_2$ ($C_2\times C_4$), $C_2^3:C_4$ ($D_4$)

Order 16: $C_2^2\times C_4$ ($C_2^2:C_4$) x 3, $C_4^2$ ($C_4^2$), $C_2^4$ ($C_2\times D_4$), $C_2\times Q_8$ ($C_4^2$), $C_2\times D_4$ ($D_4:C_2$), $C_2\times D_4$ ($C_2^2\times C_4$), $C_2^2\times C_4$ ($C_2^2\times C_4$)

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

Order 4: $C_2^2$ ($C_2^3.C_2^3$), $C_2^2$ ($C_2^4:C_4$), $C_2^2$ ($C_2^2:C_4^2$)

Order 2: $C_2$ ($(C_2^2\times Q_8):C_4$), $C_2$ ($C_2^4.D_4$), $C_2$ ($C_2^3:C_4^2$)

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

Series

Derived series

$C_4^2:C_4^2$

$\rhd$

$C_2\times C_4$

$\rhd$

$C_1$

Chief series

$C_4^2:C_4^2$

$\rhd$

$C_4^2.D_4$

$\rhd$

$C_4^2:C_2^2$

$\rhd$

$C_2^2\times D_4$

$\rhd$

$C_2^2\times C_4$

$\rhd$

$C_2\times C_4$

$\rhd$

$C_2^2$

$\rhd$

$C_2$

$\rhd$

$C_1$

Lower central series

$C_4^2:C_4^2$

$\rhd$

$C_2\times C_4$

$\rhd$

$C_2^2$

$\rhd$

$C_2$

$\rhd$

$C_1$

Upper central series

$C_1$

$\lhd$

$C_2^2$

$\lhd$

$C_2^2\times C_4$

$\lhd$

$C_4^2:C_2^2$

$\lhd$

$C_4^2:C_4^2$

Character theory

Complex character table

See the $46 \times 46$ character table. Alternatively, you may search for characters of this group with desired properties.

Rational character table

See the $31 \times 31$ rational character table.