Properties

Label 2.2e7_7.4t3.5
Dimension 2
Group $D_4$
Conductor $ 2^{7} \cdot 7 $
Frobenius-Schur indicator 1

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Basic invariants

Dimension:$2$
Group:$D_4$
Conductor:$896= 2^{7} \cdot 7 $
Artin number field: Splitting field of $f= x^{8} + 16 x^{6} + 38 x^{4} + 16 x^{2} + 1 $ over $\Q$
Size of Galois orbit: 1
Smallest containing permutation representation: $D_{4}$
Parity: Even

Galois action

Roots of defining polynomial

The roots of $f$ are computed in $\Q_{ 31 }$ to precision 6.
Roots:
$r_{ 1 }$ $=$ $ 2 + 19\cdot 31 + 20\cdot 31^{2} + 24\cdot 31^{3} + 23\cdot 31^{4} + 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 2 }$ $=$ $ 12 + 27\cdot 31 + 5\cdot 31^{2} + 19\cdot 31^{4} + 10\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 3 }$ $=$ $ 13 + 22\cdot 31 + 8\cdot 31^{2} + 25\cdot 31^{3} + 24\cdot 31^{4} + 26\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 4 }$ $=$ $ 15 + 12\cdot 31 + 10\cdot 31^{2} + 30\cdot 31^{3} + 13\cdot 31^{4} + 16\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 5 }$ $=$ $ 16 + 18\cdot 31 + 20\cdot 31^{2} + 17\cdot 31^{4} + 14\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 6 }$ $=$ $ 18 + 8\cdot 31 + 22\cdot 31^{2} + 5\cdot 31^{3} + 6\cdot 31^{4} + 4\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 7 }$ $=$ $ 19 + 3\cdot 31 + 25\cdot 31^{2} + 30\cdot 31^{3} + 11\cdot 31^{4} + 20\cdot 31^{5} +O\left(31^{ 6 }\right)$
$r_{ 8 }$ $=$ $ 29 + 11\cdot 31 + 10\cdot 31^{2} + 6\cdot 31^{3} + 7\cdot 31^{4} + 29\cdot 31^{5} +O\left(31^{ 6 }\right)$

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

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

Character values on conjugacy classes

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