Basic invariants
Dimension: | $2$ |
Group: | $D_{4}$ |
Conductor: | \(248\)\(\medspace = 2^{3} \cdot 31 \) |
Frobenius-Schur indicator: | $1$ |
Root number: | $1$ |
Artin stem field: | Galois closure of 4.2.1984.1 |
Galois orbit size: | $1$ |
Smallest permutation container: | $D_{4}$ |
Parity: | odd |
Determinant: | 1.248.2t1.b.a |
Projective image: | $C_2^2$ |
Projective field: | Galois closure of \(\Q(\sqrt{2}, \sqrt{-31})\) |
Defining polynomial
$f(x)$ | $=$ | \( x^{4} - 2x^{3} + x^{2} - 2 \) . |
The roots of $f$ are computed in $\Q_{ 71 }$ to precision 5.
Roots:
$r_{ 1 }$ | $=$ |
\( 4 + 60\cdot 71 + 18\cdot 71^{2} + 46\cdot 71^{3} + 61\cdot 71^{4} +O(71^{5})\)
$r_{ 2 }$ |
$=$ |
\( 17 + 56\cdot 71 + 17\cdot 71^{2} + 64\cdot 71^{3} + 33\cdot 71^{4} +O(71^{5})\)
| $r_{ 3 }$ |
$=$ |
\( 55 + 14\cdot 71 + 53\cdot 71^{2} + 6\cdot 71^{3} + 37\cdot 71^{4} +O(71^{5})\)
| $r_{ 4 }$ |
$=$ |
\( 68 + 10\cdot 71 + 52\cdot 71^{2} + 24\cdot 71^{3} + 9\cdot 71^{4} +O(71^{5})\)
| |
Generators of the action on the roots $r_1, \ldots, r_{ 4 }$
Cycle notation |
Character values on conjugacy classes
Size | Order | Action on $r_1, \ldots, r_{ 4 }$ | Character value |
$1$ | $1$ | $()$ | $2$ |
$1$ | $2$ | $(1,4)(2,3)$ | $-2$ |
$2$ | $2$ | $(1,2)(3,4)$ | $0$ |
$2$ | $2$ | $(1,4)$ | $0$ |
$2$ | $4$ | $(1,3,4,2)$ | $0$ |
The blue line marks the conjugacy class containing complex conjugation.