Properties

Label 2.4.9.2
Base \(\Q_{2}\)
Degree \(4\)
e \(4\)
f \(1\)
c \(9\)
Galois group $D_{4}$ (as 4T3)

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Defining polynomial

\(x^{4} + 2 x^{2} + 2\) Copy content Toggle raw display

Invariants

Base field: $\Q_{2}$
Degree $d$: $4$
Ramification exponent $e$: $4$
Residue field degree $f$: $1$
Discriminant exponent $c$: $9$
Discriminant root field: $\Q_{2}(\sqrt{2})$
Root number: $-1$
$\card{ \Aut(K/\Q_{ 2 }) }$: $2$
This field is not Galois over $\Q_{2}.$
Visible slopes:$[2, 7/2]$

Intermediate fields

$\Q_{2}(\sqrt{-1})$

Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.

Unramified/totally ramified tower

Unramified subfield:$\Q_{2}$
Relative Eisenstein polynomial: \( x^{4} + 2 x^{2} + 2 \) Copy content Toggle raw display

Ramification polygon

Data not computed

Invariants of the Galois closure

Galois group: $D_4$ (as 4T3)
Inertia group: $D_4$ (as 4T3)
Wild inertia group: $D_4$
Unramified degree: $1$
Tame degree: $1$
Wild slopes: $[2, 3, 7/2]$
Galois mean slope: $11/4$
Galois splitting model:$x^{4} - 2 x^{2} + 2$