Defining polynomial
\(x^{12} - 2 x^{11} + 8 x^{10} - 2 x^{9} + 8 x^{8} + 4 x^{7} + 2 x^{6} + 8 x^{5} - 4 x^{4} + 4 x^{3} + 4\) |
Invariants
Base field: | $\Q_{2}$ |
Degree $d$: | $12$ |
Ramification exponent $e$: | $6$ |
Residue field degree $f$: | $2$ |
Discriminant exponent $c$: | $16$ |
Discriminant root field: | $\Q_{2}$ |
Root number: | $-1$ |
$\card{ \Aut(K/\Q_{ 2 }) }$: | $2$ |
This field is not Galois over $\Q_{2}.$ | |
Visible slopes: | $[2]$ |
Intermediate fields
$\Q_{2}(\sqrt{5})$, 2.6.4.2 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Unramified/totally ramified tower
Unramified subfield: | $\Q_{2}(\sqrt{5})$ $\cong \Q_{2}(t)$ where $t$ is a root of \( x^{2} + x + 1 \) |
Relative Eisenstein polynomial: | \( x^{6} + 2 t x^{5} + 2 x^{4} + \left(2 t + 2\right) x^{3} + 2 t \) $\ \in\Q_{2}(t)[x]$ |
Ramification polygon
Residual polynomials: | $z + t$,$z^{4} + z^{2} + 1$ |
Associated inertia: | $1$,$1$ |
Indices of inseparability: | $[3, 0]$ |
Invariants of the Galois closure
Galois group: | $A_4^2:C_2^2$ (as 12T158) |
Inertia group: | Intransitive group isomorphic to $C_2^3:A_4$ |
Wild inertia group: | $C_2^5$ |
Unramified degree: | $6$ |
Tame degree: | $3$ |
Wild slopes: | $[4/3, 4/3, 4/3, 4/3, 2]$ |
Galois mean slope: | $79/48$ |
Galois splitting model: | $x^{12} + 9 x^{10} - 6 x^{8} - 43 x^{6} + 54 x^{4} - 15 x^{2} + 1$ |