Defining polynomial
|
\(x^{16} + 4 x^{15} + 2 x^{12} + 4 x^{9} + 4 x^{6} + 4 x^{2} + 6\)
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Invariants
| Base field: | $\Q_{2}$ |
| Degree $d$: | $16$ |
| Ramification index $e$: | $16$ |
| Residue field degree $f$: | $1$ |
| Discriminant exponent $c$: | $40$ |
| Discriminant root field: | $\Q_{2}$ |
| Root number: | $-1$ |
| $\Aut(K/\Q_{2})$: | $C_2^2$ |
| This field is not Galois over $\Q_{2}.$ | |
| Visible Artin slopes: | $[2, 2, \frac{5}{2}, 3]$ |
| Visible Swan slopes: | $[1,1,\frac{3}{2},2]$ |
| Means: | $\langle\frac{1}{2}, \frac{3}{4}, \frac{9}{8}, \frac{25}{16}\rangle$ |
| Rams: | $(1, 1, 3, 7)$ |
| Jump set: | $[1, 3, 6, 12, 32]$ |
| Roots of unity: | $2$ |
Intermediate fields
| $\Q_{2}(\sqrt{-5})$, $\Q_{2}(\sqrt{-2})$, $\Q_{2}(\sqrt{2\cdot 5})$, 2.1.4.6a1.2, 2.1.4.8b1.4, 2.1.4.8b1.5, 2.1.8.18b1.8, 2.1.8.18b1.12, 2.1.8.16c1.6 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Canonical tower
| Unramified subfield: | $\Q_{2}$ |
| Relative Eisenstein polynomial: |
\( x^{16} + 4 x^{15} + 2 x^{12} + 4 x^{9} + 4 x^{6} + 4 x^{2} + 6 \)
|
Ramification polygon
| Residual polynomials: | $z^{12} + 1$,$z^2 + 1$,$z + 1$ |
| Associated inertia: | $2$,$1$,$1$ |
| Indices of inseparability: | $[25, 18, 12, 12, 0]$ |
Invariants of the Galois closure
| Galois degree: | $32$ |
| Galois group: | $C_2\times \SD_{16}$ (as 16T48) |
| Inertia group: | $C_2\times Q_8$ (as 16T7) |
| Wild inertia group: | $C_2\times Q_8$ |
| Galois unramified degree: | $2$ |
| Galois tame degree: | $1$ |
| Galois Artin slopes: | $[2, 2, \frac{5}{2}, 3]$ |
| Galois Swan slopes: | $[1,1,\frac{3}{2},2]$ |
| Galois mean slope: | $2.5$ |
| Galois splitting model: | $x^{16} + 4 x^{14} + 4 x^{12} + 16 x^{10} - 20 x^{8} - 8 x^{6} + 16 x^{4} + 16 x^{2} + 4$ |