Defining polynomial
|
$( x^{4} + 11 x^{2} + 136 x + 5 )^{2} + 157$
|
Invariants
| Base field: | $\Q_{157}$ |
| Degree $d$: | $8$ |
| Ramification index $e$: | $2$ |
| Residue field degree $f$: | $4$ |
| Discriminant exponent $c$: | $4$ |
| Discriminant root field: | $\Q_{157}$ |
| Root number: | $-1$ |
| $\Aut(K/\Q_{157})$ $=$$\Gal(K/\Q_{157})$: | $C_2\times C_4$ |
| This field is Galois and abelian over $\Q_{157}.$ | |
| Visible Artin slopes: | $[\ ]$ |
| Visible Swan slopes: | $[]$ |
| Means: | $\langle\ \rangle$ |
| Rams: | $(\ )$ |
| Jump set: | undefined |
| Roots of unity: | $607573200 = (157^{ 4 } - 1)$ |
Intermediate fields
| $\Q_{157}(\sqrt{2})$, $\Q_{157}(\sqrt{157})$, $\Q_{157}(\sqrt{157\cdot 2})$, 157.4.1.0a1.1, 157.2.2.2a1.2, 157.2.2.2a1.1 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Canonical tower
| Unramified subfield: | 157.4.1.0a1.1 $\cong \Q_{157}(t)$ where $t$ is a root of
\( x^{4} + 11 x^{2} + 136 x + 5 \)
|
| Relative Eisenstein polynomial: |
\( x^{2} + 157 \)
$\ \in\Q_{157}(t)[x]$
|
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: | not computed |