Defining polynomial
|
\(x^{4} + 2 x^{2} + 4 x + 2\)
|
Invariants
| Base field: | $\Q_{2}$ |
| Degree $d$: | $4$ |
| Ramification exponent $e$: | $4$ |
| Residue field degree $f$: | $1$ |
| Discriminant exponent $c$: | $8$ |
| Discriminant root field: | $\Q_{2}$ |
| Root number: | $-1$ |
| $\card{ \Gal(K/\Q_{ 2 }) }$: | $4$ |
| This field is Galois and abelian over $\Q_{2}.$ | |
| Visible slopes: | $[2, 3]$ |
Intermediate fields
| $\Q_{2}(\sqrt{-1})$, $\Q_{2}(\sqrt{-2})$, $\Q_{2}(\sqrt{2})$ |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Unramified/totally ramified tower
| Unramified subfield: | $\Q_{2}$ |
| Relative Eisenstein polynomial: |
\( x^{4} + 2 x^{2} + 4 x + 2 \)
|
Ramification polygon
| Residual polynomials: | $z + 1$,$z^{2} + 1$ |
| Associated inertia: | $1$,$1$ |
| Indices of inseparability: | $[5, 2, 0]$ |
Invariants of the Galois closure
| Galois group: | $C_2^2$ (as 4T2) |
| Inertia group: | $C_2^2$ (as 4T2) |
| Wild inertia group: | $C_2^2$ |
| Unramified degree: | $1$ |
| Tame degree: | $1$ |
| Wild slopes: | $[2, 3]$ |
| Galois mean slope: | $2$ |
| Galois splitting model: |
$x^{4} + 6 x^{2} + 1$
|