Properties

Label 2.2e8.4t3.3
Dimension 2
Group $D_4$
Conductor $ 2^{8}$
Frobenius-Schur indicator 1

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Basic invariants

Dimension:$2$
Group:$D_4$
Conductor:$256= 2^{8} $
Artin number field: Splitting field of $f= x^{8} - 4 x^{6} + 8 x^{4} - 4 x^{2} + 1 $ 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 $\Q_{ 73 }$ to precision 5.
Roots:
$r_{ 1 }$ $=$ $ 5 + 72\cdot 73 + 34\cdot 73^{2} + 34\cdot 73^{3} + 49\cdot 73^{4} +O\left(73^{ 5 }\right)$
$r_{ 2 }$ $=$ $ 19 + 66\cdot 73 + 37\cdot 73^{2} + 34\cdot 73^{3} + 18\cdot 73^{4} +O\left(73^{ 5 }\right)$
$r_{ 3 }$ $=$ $ 23 + 12\cdot 73 + 16\cdot 73^{2} + 36\cdot 73^{3} + 2\cdot 73^{4} +O\left(73^{ 5 }\right)$
$r_{ 4 }$ $=$ $ 29 + 20\cdot 73 + 49\cdot 73^{2} + 5\cdot 73^{3} + 7\cdot 73^{4} +O\left(73^{ 5 }\right)$
$r_{ 5 }$ $=$ $ 44 + 52\cdot 73 + 23\cdot 73^{2} + 67\cdot 73^{3} + 65\cdot 73^{4} +O\left(73^{ 5 }\right)$
$r_{ 6 }$ $=$ $ 50 + 60\cdot 73 + 56\cdot 73^{2} + 36\cdot 73^{3} + 70\cdot 73^{4} +O\left(73^{ 5 }\right)$
$r_{ 7 }$ $=$ $ 54 + 6\cdot 73 + 35\cdot 73^{2} + 38\cdot 73^{3} + 54\cdot 73^{4} +O\left(73^{ 5 }\right)$
$r_{ 8 }$ $=$ $ 68 + 38\cdot 73^{2} + 38\cdot 73^{3} + 23\cdot 73^{4} +O\left(73^{ 5 }\right)$

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

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

Character values on conjugacy classes

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