Subgroup ($H$) information
| Description: | $C_8.C_4$ |
| Order: | \(32\)\(\medspace = 2^{5} \) |
| Index: | \(4\)\(\medspace = 2^{2} \) |
| Exponent: | \(8\)\(\medspace = 2^{3} \) |
| Generators: |
$\left(\begin{array}{rr}
13 & 0 \\
0 & 4
\end{array}\right), \left(\begin{array}{rr}
1 & 0 \\
0 & 16
\end{array}\right), \left(\begin{array}{rr}
16 & 0 \\
0 & 16
\end{array}\right), \left(\begin{array}{rr}
0 & 9 \\
9 & 0
\end{array}\right), \left(\begin{array}{rr}
9 & 0 \\
0 & 15
\end{array}\right)$
|
| Nilpotency class: | $3$ |
| Derived length: | $2$ |
The subgroup is characteristic (hence normal), nonabelian, a $p$-group (hence nilpotent, solvable, supersolvable, monomial, elementary, and hyperelementary), and metacyclic (hence metabelian).
Ambient group ($G$) information
| Description: | $C_{16}.D_4$ |
| Order: | \(128\)\(\medspace = 2^{7} \) |
| Exponent: | \(16\)\(\medspace = 2^{4} \) |
| Nilpotency class: | $3$ |
| Derived length: | $2$ |
The ambient group is nonabelian, a $p$-group (hence nilpotent, solvable, supersolvable, monomial, elementary, and hyperelementary), and metabelian.
Quotient group ($Q$) structure
| Description: | $C_4$ |
| Order: | \(4\)\(\medspace = 2^{2} \) |
| Exponent: | \(4\)\(\medspace = 2^{2} \) |
| Automorphism Group: | $C_2$, of order \(2\) |
| Outer Automorphisms: | $C_2$, of order \(2\) |
| Nilpotency class: | $1$ |
| Derived length: | $1$ |
The quotient is cyclic (hence abelian, nilpotent, solvable, supersolvable, monomial, elementary, hyperelementary, metacyclic, metabelian, a Z-group, and an A-group) and a $p$-group.
Automorphism information
Since the subgroup $H$ is characteristic, the automorphism group $\operatorname{Aut}(G)$ of the ambient group acts on $H$, yielding a homomorphism $\operatorname{res} : \operatorname{Aut}(G) \to \operatorname{Aut}(H)$. The image of $\operatorname{res}$ on the inner automorphism group $\operatorname{Inn}(G)$ is the Weyl group $W = G / Z_G(H)$.
| $\operatorname{Aut}(G)$ | $C_4^2.C_2^4$, of order \(256\)\(\medspace = 2^{8} \) |
| $\operatorname{Aut}(H)$ | $C_8:C_2^3$, of order \(64\)\(\medspace = 2^{6} \) |
| $\operatorname{res}(\operatorname{Aut}(G))$ | $C_8:C_2^3$, of order \(64\)\(\medspace = 2^{6} \) |
| $\card{\operatorname{ker}(\operatorname{res})}$ | \(4\)\(\medspace = 2^{2} \) |
| $W$ | $D_4$, of order \(8\)\(\medspace = 2^{3} \) |
Related subgroups
| Centralizer: | $C_{16}$ | ||
| Normalizer: | $C_{16}.D_4$ | ||
| Minimal over-subgroups: | $D_8:C_4$ | ||
| Maximal under-subgroups: | $C_2\times C_8$ | $\OD_{16}$ | $\OD_{16}$ |
Other information
| Möbius function | $0$ |
| Projective image | $C_4\times D_4$ |