Basic invariants
| Dimension: | $2$ |
| Group: | $D_{9}$ |
| Conductor: | \(367\) |
| Frobenius-Schur indicator: | $1$ |
| Root number: | $1$ |
| Artin stem field: | Galois closure of 9.1.18141126721.1 |
| Galois orbit size: | $3$ |
| Smallest permutation container: | $D_{9}$ |
| Parity: | odd |
| Determinant: | 1.367.2t1.a.a |
| Projective image: | $D_9$ |
| Projective stem field: | Galois closure of 9.1.18141126721.1 |
Defining polynomial
| $f(x)$ | $=$ |
\( x^{9} - x^{8} - 3x^{7} - x^{6} + 6x^{5} - x^{4} + 6x^{3} - 7x^{2} + 2x - 3 \)
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The roots of $f$ are computed in an extension of $\Q_{ 13 }$ to precision 5.
Minimal polynomial of a generator $a$ of $K$ over $\mathbb{Q}_{ 13 }$:
\( x^{3} + 2x + 11 \)
Roots:
| $r_{ 1 }$ | $=$ |
\( 11 a^{2} + 5 a + 5 + \left(6 a^{2} + 3\right)\cdot 13 + \left(5 a^{2} + 9 a + 9\right)\cdot 13^{2} + \left(9 a^{2} + 9 a + 9\right)\cdot 13^{3} + \left(6 a^{2} + 10 a + 12\right)\cdot 13^{4} +O(13^{5})\)
|
| $r_{ 2 }$ | $=$ |
\( 12 a^{2} + 5 a + 5 + \left(8 a + 4\right)\cdot 13 + \left(12 a^{2} + 8 a + 1\right)\cdot 13^{2} + \left(6 a^{2} + 3 a + 1\right)\cdot 13^{3} + \left(11 a^{2} + 11\right)\cdot 13^{4} +O(13^{5})\)
|
| $r_{ 3 }$ | $=$ |
\( 2 a^{2} + 11 a + 6 + \left(4 a^{2} + 10 a + 8\right)\cdot 13 + \left(2 a^{2} + 4 a\right)\cdot 13^{2} + \left(7 a^{2} + 8 a + 11\right)\cdot 13^{3} + \left(a^{2} + 6 a + 5\right)\cdot 13^{4} +O(13^{5})\)
|
| $r_{ 4 }$ | $=$ |
\( 7 a^{2} + 10 a + 7 + \left(a^{2} + 10 a + 9\right)\cdot 13 + \left(a^{2} + 3 a + 12\right)\cdot 13^{2} + \left(9 a^{2} + 8 a + 3\right)\cdot 13^{3} + \left(7 a^{2} + 6 a + 10\right)\cdot 13^{4} +O(13^{5})\)
|
| $r_{ 5 }$ | $=$ |
\( 11 a^{2} + 7 a + 1 + \left(4 a^{2} + 9 a + 9\right)\cdot 13 + \left(11 a^{2} + 5 a + 10\right)\cdot 13^{2} + \left(6 a^{2} + 8 a + 2\right)\cdot 13^{3} + \left(11 a^{2} + 3 a + 7\right)\cdot 13^{4} +O(13^{5})\)
|
| $r_{ 6 }$ | $=$ |
\( 3 a^{2} + 7 a + 12 + \left(12 a^{2} + 6 a + 5\right)\cdot 13 + \left(3 a^{2} + 9 a + 9\right)\cdot 13^{2} + \left(10 a^{2} + 9 a + 11\right)\cdot 13^{3} + \left(11 a^{2} + 9 a + 11\right)\cdot 13^{4} +O(13^{5})\)
|
| $r_{ 7 }$ | $=$ |
\( 12 a^{2} + 12 a + 11 + \left(8 a^{2} + 9 a + 5\right)\cdot 13 + \left(10 a^{2} + 10 a + 5\right)\cdot 13^{2} + \left(8 a^{2} + 7 a + 5\right)\cdot 13^{3} + \left(2 a^{2} + 12 a + 8\right)\cdot 13^{4} +O(13^{5})\)
|
| $r_{ 8 }$ | $=$ |
\( 10 a + 12 + \left(2 a^{2} + a + 9\right)\cdot 13 + \left(5 a^{2} + 12 a + 8\right)\cdot 13^{2} + \left(9 a^{2} + 7 a + 9\right)\cdot 13^{3} + \left(4 a^{2} + 8 a + 5\right)\cdot 13^{4} +O(13^{5})\)
|
| $r_{ 9 }$ | $=$ |
\( 7 a^{2} + 11 a + 7 + \left(10 a^{2} + 6 a + 8\right)\cdot 13 + \left(12 a^{2} + 6\right)\cdot 13^{2} + \left(9 a^{2} + a + 9\right)\cdot 13^{3} + \left(6 a^{2} + 6 a + 4\right)\cdot 13^{4} +O(13^{5})\)
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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 |
| $1$ | $1$ | $()$ | $2$ |
| $9$ | $2$ | $(1,3)(2,5)(4,6)(7,9)$ | $0$ |
| $2$ | $3$ | $(1,3,8)(2,4,9)(5,7,6)$ | $-1$ |
| $2$ | $9$ | $(1,7,9,3,6,2,8,5,4)$ | $-\zeta_{9}^{4} + \zeta_{9}^{2} - \zeta_{9}$ |
| $2$ | $9$ | $(1,9,6,8,4,7,3,2,5)$ | $\zeta_{9}^{5} + \zeta_{9}^{4}$ |
| $2$ | $9$ | $(1,6,4,3,5,9,8,7,2)$ | $-\zeta_{9}^{5} - \zeta_{9}^{2} + \zeta_{9}$ |
The blue line marks the conjugacy class containing complex conjugation.