Defining polynomial
|
$( x^{2} + 4 x + 2 )^{4} + 20 x + 15$
|
Invariants
| Base field: | $\Q_{5}$ |
|
| Degree $d$: | $8$ |
|
| Ramification index $e$: | $4$ |
|
| Residue field degree $f$: | $2$ |
|
| Discriminant exponent $c$: | $6$ |
|
| Discriminant root field: | $\Q_{5}(\sqrt{2})$ | |
| Root number: | $1$ | |
| $\Aut(K/\Q_{5})$ $=$ $\Gal(K/\Q_{5})$: | $C_8$ | |
| This field is Galois and abelian over $\Q_{5}.$ | ||
| Visible Artin slopes: | $[\ ]$ | |
| Visible Swan slopes: | $[\ ]$ | |
| Means: | $\langle\ \rangle$ | |
| Rams: | $(\ )$ | |
| Jump set: | undefined | |
| Roots of unity: | $24 = (5^{ 2 } - 1)$ |
|
Intermediate fields
| $\Q_{5}(\sqrt{2})$, 5.2.2.2a1.1 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Canonical tower
| Unramified subfield: | $\Q_{5}(\sqrt{2})$ $\cong \Q_{5}(t)$ where $t$ is a root of
\( x^{2} + 4 x + 2 \)
|
|
| Relative Eisenstein polynomial: |
\( x^{4} + 20 t + 15 \)
$\ \in\Q_{5}(t)[x]$
|
Ramification polygon
| Residual polynomials: | $z^3 + 4 z^2 + z + 4$ |
| Associated inertia: | $1$ |
| Indices of inseparability: | $[0]$ |
Invariants of the Galois closure
| Galois degree: | $8$ |
| Galois group: | $C_8$ (as 8T1) |
| Inertia group: | Intransitive group isomorphic to $C_4$ |
| Wild inertia group: | $C_1$ |
| Galois unramified degree: | $2$ |
| Galois tame degree: | $4$ |
| Galois Artin slopes: | $[\ ]$ |
| Galois Swan slopes: | $[\ ]$ |
| Galois mean slope: | $0.75$ |
| Galois splitting model: | $x^{8} - x^{7} + 10 x^{6} - 79 x^{5} + 134 x^{4} + 41 x^{3} + 245 x^{2} - 846 x + 596$ |