Subgroup ($H$) information
| Description: | $C_2\times C_{68}$ |
| Order: | \(136\)\(\medspace = 2^{3} \cdot 17 \) |
| Index: | \(8\)\(\medspace = 2^{3} \) |
| Exponent: | \(68\)\(\medspace = 2^{2} \cdot 17 \) |
| Generators: |
$b^{4}c^{34}, c^{51}, c^{34}, c^{4}$
|
| Nilpotency class: | $1$ |
| Derived length: | $1$ |
The subgroup is characteristic (hence normal), abelian (hence nilpotent, solvable, supersolvable, monomial, metabelian, and an A-group), elementary for $p = 2$ (hence hyperelementary), and metacyclic.
Ambient group ($G$) information
| Description: | $C_{68}.D_8$ |
| Order: | \(1088\)\(\medspace = 2^{6} \cdot 17 \) |
| Exponent: | \(136\)\(\medspace = 2^{3} \cdot 17 \) |
| Derived length: | $2$ |
The ambient group is nonabelian, supersolvable (hence solvable and monomial), hyperelementary for $p = 2$, and metabelian.
Quotient group ($Q$) structure
| Description: | $D_4$ |
| Order: | \(8\)\(\medspace = 2^{3} \) |
| Exponent: | \(4\)\(\medspace = 2^{2} \) |
| Automorphism Group: | $D_4$, of order \(8\)\(\medspace = 2^{3} \) |
| Outer Automorphisms: | $C_2$, of order \(2\) |
| Nilpotency class: | $2$ |
| Derived length: | $2$ |
The quotient is nonabelian, a $p$-group (hence nilpotent, solvable, supersolvable, monomial, elementary, and hyperelementary), metacyclic (hence metabelian), and rational.
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 $W = G / Z_G(H)$.
| $\operatorname{Aut}(G)$ | $C_{17}:((C_2^4\times C_8).C_2^5)$ |
| $\operatorname{Aut}(H)$ | $D_4\times C_{16}$, of order \(128\)\(\medspace = 2^{7} \) |
| $\operatorname{res}(\operatorname{Aut}(G))$ | $C_2\times C_{16}$, of order \(32\)\(\medspace = 2^{5} \) |
| $\card{\operatorname{ker}(\operatorname{res})}$ | \(2176\)\(\medspace = 2^{7} \cdot 17 \) |
| $W$ | $C_2$, of order \(2\) |
Related subgroups
| Centralizer: | $C_4:C_{136}$ | |||
| Normalizer: | $C_{68}.D_8$ | |||
| Minimal over-subgroups: | $C_4\times C_{68}$ | $C_{34}:Q_8$ | $C_2\times C_{136}$ | |
| Maximal under-subgroups: | $C_2\times C_{34}$ | $C_{68}$ | $C_{68}$ | $C_2\times C_4$ |
Other information
| Möbius function | $0$ |
| Projective image | $D_{34}:C_4$ |