Defining polynomial
|
\(x^{12} + 4 x^{11} + 8 x^{10} + 12 x^{9} + 16 x^{8} + 16 x^{7} + 12 x^{6} + 8 x^{5} + 4 x^{4} + 12\)
|
Invariants
| Base field: | $\Q_{2}$ |
| Degree $d$: | $12$ |
| Ramification exponent $e$: | $6$ |
| Residue field degree $f$: | $2$ |
| Discriminant exponent $c$: | $16$ |
| Discriminant root field: | $\Q_{2}(\sqrt{5})$ |
| Root number: | $-1$ |
| $\card{ \Aut(K/\Q_{ 2 }) }$: | $4$ |
| This field is not Galois over $\Q_{2}.$ | |
| Visible slopes: | $[2]$ |
Intermediate fields
| $\Q_{2}(\sqrt{5})$, 2.3.2.1 x3, 2.6.4.1 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Unramified/totally ramified tower
| Unramified subfield: | $\Q_{2}(\sqrt{5})$ $\cong \Q_{2}(t)$ where $t$ is a root of
\( x^{2} + x + 1 \)
|
| Relative Eisenstein polynomial: |
\( x^{6} + 2 x^{5} + 2 x^{4} + 2 x^{3} + 2 x^{2} + 4 t + 2 \)
$\ \in\Q_{2}(t)[x]$
|
Ramification polygon
| Residual polynomials: | $z + 1$,$z^{4} + z^{2} + 1$ |
| Associated inertia: | $1$,$1$ |
| Indices of inseparability: | $[3, 0]$ |
Invariants of the Galois closure
| Galois group: | $A_4:C_4$ (as 12T30) |
| Inertia group: | Intransitive group isomorphic to $C_2\times A_4$ |
| Wild inertia group: | $C_2^3$ |
| Unramified degree: | $2$ |
| Tame degree: | $3$ |
| Wild slopes: | $[4/3, 4/3, 2]$ |
| Galois mean slope: | $19/12$ |
| Galois splitting model: | $x^{12} - 4 x^{11} + 9 x^{10} + 2 x^{9} - 42 x^{8} + 112 x^{7} - 99 x^{6} - 84 x^{5} + 366 x^{4} - 314 x^{3} + 137 x^{2} - 16 x - 1$ |