Basic invariants
Dimension: | $2$ |
Group: | $D_4$ |
Conductor: | \(224\)\(\medspace = 2^{5} \cdot 7 \) |
Frobenius-Schur indicator: | $1$ |
Root number: | $1$ |
Artin field: | Galois closure of 8.0.157351936.3 |
Galois orbit size: | $1$ |
Smallest permutation container: | $D_{4}$ |
Parity: | odd |
Determinant: | 1.56.2t1.b.a |
Projective image: | $C_2^2$ |
Projective field: | Galois closure of \(\Q(\sqrt{2}, \sqrt{-7})\) |
Defining polynomial
$f(x)$ | $=$ | \( x^{8} + 2x^{6} + 10x^{4} + 2x^{2} + 1 \) . |
The roots of $f$ are computed in $\Q_{ 71 }$ to precision 5.
Roots:
$r_{ 1 }$ | $=$ | \( 7 + 18\cdot 71 + 3\cdot 71^{2} + 9\cdot 71^{3} + 41\cdot 71^{4} +O(71^{5})\) |
$r_{ 2 }$ | $=$ | \( 10 + 35\cdot 71 + 57\cdot 71^{2} + 6\cdot 71^{3} + 67\cdot 71^{4} +O(71^{5})\) |
$r_{ 3 }$ | $=$ | \( 17 + 48\cdot 71 + 26\cdot 71^{2} + 61\cdot 71^{3} + 24\cdot 71^{4} +O(71^{5})\) |
$r_{ 4 }$ | $=$ | \( 25 + 46\cdot 71 + 14\cdot 71^{2} + 15\cdot 71^{3} + 21\cdot 71^{4} +O(71^{5})\) |
$r_{ 5 }$ | $=$ | \( 46 + 24\cdot 71 + 56\cdot 71^{2} + 55\cdot 71^{3} + 49\cdot 71^{4} +O(71^{5})\) |
$r_{ 6 }$ | $=$ | \( 54 + 22\cdot 71 + 44\cdot 71^{2} + 9\cdot 71^{3} + 46\cdot 71^{4} +O(71^{5})\) |
$r_{ 7 }$ | $=$ | \( 61 + 35\cdot 71 + 13\cdot 71^{2} + 64\cdot 71^{3} + 3\cdot 71^{4} +O(71^{5})\) |
$r_{ 8 }$ | $=$ | \( 64 + 52\cdot 71 + 67\cdot 71^{2} + 61\cdot 71^{3} + 29\cdot 71^{4} +O(71^{5})\) |
Generators of the action on the roots $r_1, \ldots, r_{ 8 }$
Cycle notation |
Character values on conjugacy classes
Size | Order | Action on $r_1, \ldots, r_{ 8 }$ | Character value |
$1$ | $1$ | $()$ | $2$ |
$1$ | $2$ | $(1,2)(3,4)(5,6)(7,8)$ | $-2$ |
$2$ | $2$ | $(1,3)(2,4)(5,7)(6,8)$ | $0$ |
$2$ | $2$ | $(1,8)(2,7)(3,5)(4,6)$ | $0$ |
$2$ | $4$ | $(1,5,2,6)(3,8,4,7)$ | $0$ |
The blue line marks the conjugacy class containing complex conjugation.