Subgroup ($H$) information
| Description: | $C_{20}$ |
| Order: | \(20\)\(\medspace = 2^{2} \cdot 5 \) |
| Index: | \(172\)\(\medspace = 2^{2} \cdot 43 \) |
| Exponent: | \(20\)\(\medspace = 2^{2} \cdot 5 \) |
| Generators: |
$b^{430}, b^{860}, b^{688}$
|
| Nilpotency class: | $1$ |
| Derived length: | $1$ |
The subgroup is characteristic (hence normal) and cyclic (hence abelian, nilpotent, solvable, supersolvable, monomial, elementary ($p = 2,5$), hyperelementary, metacyclic, metabelian, a Z-group, and an A-group).
Ambient group ($G$) information
| Description: | $D_8\times C_{215}$ |
| Order: | \(3440\)\(\medspace = 2^{4} \cdot 5 \cdot 43 \) |
| Exponent: | \(1720\)\(\medspace = 2^{3} \cdot 5 \cdot 43 \) |
| Nilpotency class: | $3$ |
| Derived length: | $2$ |
The ambient group is nonabelian, elementary for $p = 2$ (hence nilpotent, solvable, supersolvable, monomial, and hyperelementary), and metacyclic (hence metabelian).
Quotient group ($Q$) structure
| Description: | $C_2\times C_{86}$ |
| Order: | \(172\)\(\medspace = 2^{2} \cdot 43 \) |
| Exponent: | \(86\)\(\medspace = 2 \cdot 43 \) |
| Automorphism Group: | $S_3\times C_{42}$, of order \(252\)\(\medspace = 2^{2} \cdot 3^{2} \cdot 7 \) |
| Outer Automorphisms: | $S_3\times C_{42}$, of order \(252\)\(\medspace = 2^{2} \cdot 3^{2} \cdot 7 \) |
| Nilpotency class: | $1$ |
| Derived length: | $1$ |
The quotient is abelian (hence nilpotent, solvable, supersolvable, monomial, metabelian, and an A-group), elementary for $p = 2$ (hence hyperelementary), and metacyclic.
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 $W = G / Z_G(H)$.
| $\operatorname{Aut}(G)$ | $C_2\times C_{84}\times C_8:C_2^2$ |
| $\operatorname{Aut}(H)$ | $C_2\times C_4$, of order \(8\)\(\medspace = 2^{3} \) |
| $\operatorname{res}(\operatorname{Aut}(G))$ | $C_2\times C_4$, of order \(8\)\(\medspace = 2^{3} \) |
| $\card{\operatorname{ker}(\operatorname{res})}$ | \(672\)\(\medspace = 2^{5} \cdot 3 \cdot 7 \) |
| $W$ | $C_2$, of order \(2\) |
Related subgroups
| Centralizer: | $C_{1720}$ | |||
| Normalizer: | $D_8\times C_{215}$ | |||
| Minimal over-subgroups: | $C_{860}$ | $C_5\times D_4$ | $C_5\times D_4$ | $C_{40}$ |
| Maximal under-subgroups: | $C_{10}$ | $C_4$ |
Other information
| Möbius function | $-2$ |
| Projective image | $D_4\times C_{43}$ |