Defining polynomial
\(x^{8} + 204 x^{6} + 80 x^{5} + 14080 x^{4} - 6880 x^{3} + 384824 x^{2} - 499680 x + 3453444\) |
Invariants
Base field: | $\Q_{47}$ |
Degree $d$: | $8$ |
Ramification exponent $e$: | $2$ |
Residue field degree $f$: | $4$ |
Discriminant exponent $c$: | $4$ |
Discriminant root field: | $\Q_{47}$ |
Root number: | $-1$ |
$\card{ \Gal(K/\Q_{ 47 }) }$: | $8$ |
This field is Galois and abelian over $\Q_{47}.$ | |
Visible slopes: | None |
Intermediate fields
$\Q_{47}(\sqrt{5})$, $\Q_{47}(\sqrt{47})$, $\Q_{47}(\sqrt{47\cdot 5})$, 47.4.0.1, 47.4.2.1, 47.4.2.2 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Unramified/totally ramified tower
Unramified subfield: | 47.4.0.1 $\cong \Q_{47}(t)$ where $t$ is a root of \( x^{4} + 8 x^{2} + 40 x + 5 \) |
Relative Eisenstein polynomial: | \( x^{2} + 47 \) $\ \in\Q_{47}(t)[x]$ |
Ramification polygon
Residual polynomials: | $z + 2$ |
Associated inertia: | $1$ |
Indices of inseparability: | $[0]$ |
Invariants of the Galois closure
Galois group: | $C_2\times C_4$ (as 8T2) |
Inertia group: | Intransitive group isomorphic to $C_2$ |
Wild inertia group: | $C_1$ |
Unramified degree: | $4$ |
Tame degree: | $2$ |
Wild slopes: | None |
Galois mean slope: | $1/2$ |
Galois splitting model: | Not computed |