Properties

Label 2.7e2_11.8t6.1c1
Dimension 2
Group $D_{8}$
Conductor $ 7^{2} \cdot 11 $
Root number 1
Frobenius-Schur indicator 1

Related objects

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Basic invariants

Dimension:$2$
Group:$D_{8}$
Conductor:$539= 7^{2} \cdot 11 $
Artin number field: Splitting field of $f= x^{8} - 2 x^{7} + 7 x^{2} - 2 x + 4 $ over $\Q$
Size of Galois orbit: 2
Smallest containing permutation representation: $D_{8}$
Parity: Odd
Determinant: 1.11.2t1.1c1

Galois action

Roots of defining polynomial

The roots of $f$ are computed in $\Q_{ 137 }$ to precision 5.
Roots:
$r_{ 1 }$ $=$ $ 5 + 117\cdot 137 + 114\cdot 137^{2} + 91\cdot 137^{3} + 39\cdot 137^{4} +O\left(137^{ 5 }\right)$
$r_{ 2 }$ $=$ $ 60 + 23\cdot 137 + 86\cdot 137^{2} + 129\cdot 137^{3} + 112\cdot 137^{4} +O\left(137^{ 5 }\right)$
$r_{ 3 }$ $=$ $ 61 + 110\cdot 137 + 95\cdot 137^{2} + 86\cdot 137^{3} + 7\cdot 137^{4} +O\left(137^{ 5 }\right)$
$r_{ 4 }$ $=$ $ 79 + 63\cdot 137 + 115\cdot 137^{2} + 25\cdot 137^{3} + 18\cdot 137^{4} +O\left(137^{ 5 }\right)$
$r_{ 5 }$ $=$ $ 98 + 126\cdot 137 + 49\cdot 137^{2} + 135\cdot 137^{3} + 131\cdot 137^{4} +O\left(137^{ 5 }\right)$
$r_{ 6 }$ $=$ $ 119 + 3\cdot 137 + 40\cdot 137^{2} + 111\cdot 137^{3} + 40\cdot 137^{4} +O\left(137^{ 5 }\right)$
$r_{ 7 }$ $=$ $ 130 + 119\cdot 137 + 84\cdot 137^{2} + 69\cdot 137^{3} + 71\cdot 137^{4} +O\left(137^{ 5 }\right)$
$r_{ 8 }$ $=$ $ 135 + 119\cdot 137 + 97\cdot 137^{2} + 34\cdot 137^{3} + 125\cdot 137^{4} +O\left(137^{ 5 }\right)$

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

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

Character values on conjugacy classes

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