Properties

Label 2.3e2_7_13.4t3.6
Dimension 2
Group $D_4$
Conductor $ 3^{2} \cdot 7 \cdot 13 $
Frobenius-Schur indicator 1

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Basic invariants

Dimension:$2$
Group:$D_4$
Conductor:$819= 3^{2} \cdot 7 \cdot 13 $
Artin number field: Splitting field of $f= x^{8} + 19 x^{6} + 120 x^{4} + 931 x^{2} + 2401 $ over $\Q$
Size of Galois orbit: 1
Smallest containing permutation representation: $D_{4}$
Parity: Odd

Galois action

Roots of defining polynomial

The roots of $f$ are computed in $\Q_{ 31 }$ to precision 6.
Roots:
$r_{ 1 }$ $=$ $ 1 + 7\cdot 31 + 28\cdot 31^{2} + 13\cdot 31^{3} + 26\cdot 31^{4} + 20\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 2 }$ $=$ $ 2 + 10\cdot 31 + 19\cdot 31^{2} + 28\cdot 31^{4} + 19\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 3 }$ $=$ $ 7 + 13\cdot 31 + 21\cdot 31^{2} + 8\cdot 31^{3} + 8\cdot 31^{4} + 21\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 4 }$ $=$ $ 12 + 17\cdot 31 + 18\cdot 31^{3} + 15\cdot 31^{4} + 13\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 5 }$ $=$ $ 19 + 13\cdot 31 + 30\cdot 31^{2} + 12\cdot 31^{3} + 15\cdot 31^{4} + 17\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 6 }$ $=$ $ 24 + 17\cdot 31 + 9\cdot 31^{2} + 22\cdot 31^{3} + 22\cdot 31^{4} + 9\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 7 }$ $=$ $ 29 + 20\cdot 31 + 11\cdot 31^{2} + 30\cdot 31^{3} + 2\cdot 31^{4} + 11\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 8 }$ $=$ $ 30 + 23\cdot 31 + 2\cdot 31^{2} + 17\cdot 31^{3} + 4\cdot 31^{4} + 10\cdot 31^{5} +O\left(31^{ 6 }\right)$

Generators of the action on the roots $r_1, \ldots, r_{ 8 }$

Cycle notation
$(1,3)(2,7)(4,5)(6,8)$
$(1,2,6,4)(3,5,8,7)$

Character values on conjugacy classes

SizeOrderAction on $r_1, \ldots, r_{ 8 }$ Character values
$c1$
$1$ $1$ $()$ $2$
$1$ $2$ $(1,6)(2,4)(3,8)(5,7)$ $-2$
$2$ $2$ $(1,3)(2,7)(4,5)(6,8)$ $0$
$2$ $2$ $(1,7)(2,8)(3,4)(5,6)$ $0$
$2$ $4$ $(1,2,6,4)(3,5,8,7)$ $0$
The blue line marks the conjugacy class containing complex conjugation.