Defining polynomial
|
$( x^{4} + 5 x^{2} + 4 x + 3 )^{2} + 7$
|
Invariants
| Base field: | $\Q_{7}$ |
|
| Degree $d$: | $8$ |
|
| Ramification index $e$: | $2$ |
|
| Residue field degree $f$: | $4$ |
|
| Discriminant exponent $c$: | $4$ |
|
| Discriminant root field: | $\Q_{7}$ | |
| Root number: | $-1$ | |
| $\Aut(K/\Q_{7})$ $=$ $\Gal(K/\Q_{7})$: | $C_2\times C_4$ | |
| This field is Galois and abelian over $\Q_{7}.$ | ||
| Visible Artin slopes: | $[\ ]$ | |
| Visible Swan slopes: | $[\ ]$ | |
| Means: | $\langle\ \rangle$ | |
| Rams: | $(\ )$ | |
| Jump set: | undefined | |
| Roots of unity: | $2400 = (7^{ 4 } - 1)$ |
|
Intermediate fields
| $\Q_{7}(\sqrt{3})$, $\Q_{7}(\sqrt{7})$, $\Q_{7}(\sqrt{7\cdot 3})$, 7.4.1.0a1.1, 7.2.2.2a1.2, 7.2.2.2a1.1 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Canonical tower
| Unramified subfield: | 7.4.1.0a1.1 $\cong \Q_{7}(t)$ where $t$ is a root of
\( x^{4} + 5 x^{2} + 4 x + 3 \)
|
|
| Relative Eisenstein polynomial: |
\( x^{2} + 7 \)
$\ \in\Q_{7}(t)[x]$
|
Ramification polygon
| Residual polynomials: | $z + 2$ |
| Associated inertia: | $1$ |
| Indices of inseparability: | $[0]$ |
Invariants of the Galois closure
| Galois degree: | $8$ |
| Galois group: | $C_2\times C_4$ (as 8T2) |
| Inertia group: | Intransitive group isomorphic to $C_2$ |
| Wild inertia group: | $C_1$ |
| Galois unramified degree: | $4$ |
| Galois tame degree: | $2$ |
| Galois Artin slopes: | $[\ ]$ |
| Galois Swan slopes: | $[\ ]$ |
| Galois mean slope: | $0.5$ |
| Galois splitting model: | $x^{8} - x^{7} - x^{6} + 3 x^{5} - x^{4} + 6 x^{3} - 4 x^{2} - 8 x + 16$ |