Basic invariants
| Dimension: | $2$ |
| Group: | $D_{9}$ |
| Conductor: | \(983\) |
| Frobenius-Schur indicator: | $1$ |
| Root number: | $1$ |
| Artin stem field: | Galois closure of 9.1.933714431521.1 |
| Galois orbit size: | $3$ |
| Smallest permutation container: | $D_{9}$ |
| Parity: | odd |
| Determinant: | 1.983.2t1.a.a |
| Projective image: | $D_9$ |
| Projective stem field: | Galois closure of 9.1.933714431521.1 |
Defining polynomial
| $f(x)$ | $=$ |
\( x^{9} - 3x^{8} + 5x^{7} + 7x^{6} - 15x^{5} + 8x^{4} + 39x^{3} - 40x^{2} + 6x + 5 \)
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The roots of $f$ are computed in an extension of $\Q_{ 31 }$ to precision 5.
Minimal polynomial of a generator $a$ of $K$ over $\mathbb{Q}_{ 31 }$:
\( x^{3} + x + 28 \)
Roots:
| $r_{ 1 }$ | $=$ |
\( 17 a^{2} + 6 a + 22 + \left(7 a^{2} + a + 25\right)\cdot 31 + \left(17 a^{2} + 3 a + 21\right)\cdot 31^{2} + \left(29 a^{2} + 7 a + 19\right)\cdot 31^{3} + \left(3 a^{2} + 15 a + 2\right)\cdot 31^{4} +O(31^{5})\)
|
| $r_{ 2 }$ | $=$ |
\( 2 a^{2} + 2 a + 12 + \left(12 a^{2} + 18 a + 18\right)\cdot 31 + \left(3 a^{2} + 19 a + 12\right)\cdot 31^{2} + \left(28 a^{2} + 21 a + 8\right)\cdot 31^{3} + \left(26 a^{2} + 9 a + 28\right)\cdot 31^{4} +O(31^{5})\)
|
| $r_{ 3 }$ | $=$ |
\( 20 a^{2} + a + 24 + \left(26 a^{2} + 24 a + 17\right)\cdot 31 + \left(29 a^{2} + 20 a + 9\right)\cdot 31^{2} + \left(19 a^{2} + 19 a + 13\right)\cdot 31^{3} + \left(11 a^{2} + 16 a + 28\right)\cdot 31^{4} +O(31^{5})\)
|
| $r_{ 4 }$ | $=$ |
\( 17 a^{2} + 23 a + 22 + \left(7 a^{2} + 15 a + 25\right)\cdot 31 + \left(11 a^{2} + 10 a + 17\right)\cdot 31^{2} + \left(27 a^{2} + 25 a + 28\right)\cdot 31^{3} + \left(18 a^{2} + 25 a + 22\right)\cdot 31^{4} +O(31^{5})\)
|
| $r_{ 5 }$ | $=$ |
\( 27 a^{2} + 10 a + 8 + \left(a^{2} + 22 a + 1\right)\cdot 31 + \left(23 a^{2} + 25 a + 5\right)\cdot 31^{2} + \left(12 a^{2} + 9 a + 29\right)\cdot 31^{3} + \left(10 a^{2} + 5 a + 6\right)\cdot 31^{4} +O(31^{5})\)
|
| $r_{ 6 }$ | $=$ |
\( 11 a^{2} + 19 a + 18 + \left(26 a^{2} + 21 a + 17\right)\cdot 31 + \left(21 a^{2} + 14\right)\cdot 31^{2} + \left(a^{2} + 13 a + 11\right)\cdot 31^{3} + \left(6 a^{2} + 24 a + 14\right)\cdot 31^{4} +O(31^{5})\)
|
| $r_{ 7 }$ | $=$ |
\( 24 a^{2} + 2 a + 6 + \left(2 a^{2} + 18 a + 12\right)\cdot 31 + \left(17 a^{2} + 4 a + 11\right)\cdot 31^{2} + \left(16 a^{2} + 8 a + 21\right)\cdot 31^{3} + \left(14 a^{2} + a + 9\right)\cdot 31^{4} +O(31^{5})\)
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| $r_{ 8 }$ | $=$ |
\( 9 a^{2} + 28 a + 27 + \left(23 a^{2} + 19 a + 25\right)\cdot 31 + \left(28 a^{2} + 21 a + 8\right)\cdot 31^{2} + \left(13 a^{2} + 20 a + 9\right)\cdot 31^{3} + \left(23 a^{2} + 4 a + 5\right)\cdot 31^{4} +O(31^{5})\)
|
| $r_{ 9 }$ | $=$ |
\( 28 a^{2} + 2 a + 19 + \left(15 a^{2} + 14 a + 10\right)\cdot 31 + \left(2 a^{2} + 17 a + 22\right)\cdot 31^{2} + \left(5 a^{2} + 29 a + 13\right)\cdot 31^{3} + \left(8 a^{2} + 20 a + 5\right)\cdot 31^{4} +O(31^{5})\)
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Generators of the action on the roots $r_1, \ldots, r_{ 9 }$
| Cycle notation |
Character values on conjugacy classes
| Size | Order | Action on $r_1, \ldots, r_{ 9 }$ | Character value |
| $1$ | $1$ | $()$ | $2$ |
| $9$ | $2$ | $(1,3)(2,4)(6,7)(8,9)$ | $0$ |
| $2$ | $3$ | $(1,9,4)(2,8,3)(5,7,6)$ | $-1$ |
| $2$ | $9$ | $(1,2,7,9,8,6,4,3,5)$ | $\zeta_{9}^{5} + \zeta_{9}^{4}$ |
| $2$ | $9$ | $(1,7,8,4,5,2,9,6,3)$ | $-\zeta_{9}^{5} - \zeta_{9}^{2} + \zeta_{9}$ |
| $2$ | $9$ | $(1,8,5,9,3,7,4,2,6)$ | $-\zeta_{9}^{4} + \zeta_{9}^{2} - \zeta_{9}$ |
The blue line marks the conjugacy class containing complex conjugation.