Basic invariants
| Dimension: | $2$ |
| Group: | $D_{9}$ |
| Conductor: | \(1231\) |
| Frobenius-Schur indicator: | $1$ |
| Root number: | $1$ |
| Artin stem field: | Galois closure of 9.1.2296318960321.1 |
| Galois orbit size: | $3$ |
| Smallest permutation container: | $D_{9}$ |
| Parity: | odd |
| Determinant: | 1.1231.2t1.a.a |
| Projective image: | $D_9$ |
| Projective stem field: | Galois closure of 9.1.2296318960321.1 |
Defining polynomial
| $f(x)$ | $=$ |
\( x^{9} - 4x^{8} + 4x^{7} + 3x^{6} + 21x^{5} - 24x^{4} + 25x^{3} + 17x^{2} + 7x - 33 \)
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The roots of $f$ are computed in an extension of $\Q_{ 41 }$ to precision 5.
Minimal polynomial of a generator $a$ of $K$ over $\mathbb{Q}_{ 41 }$:
\( x^{3} + x + 35 \)
Roots:
| $r_{ 1 }$ | $=$ |
\( 11 a^{2} + 26 a + 2 + \left(14 a^{2} + 8 a + 1\right)\cdot 41 + \left(18 a^{2} + a + 9\right)\cdot 41^{2} + \left(3 a^{2} + 26 a + 34\right)\cdot 41^{3} + \left(31 a^{2} + a + 4\right)\cdot 41^{4} +O(41^{5})\)
|
| $r_{ 2 }$ | $=$ |
\( 8 a^{2} + 5 a + 24 + \left(7 a^{2} + 31 a + 29\right)\cdot 41 + \left(21 a^{2} + 14 a + 3\right)\cdot 41^{2} + \left(13 a^{2} + 10 a + 10\right)\cdot 41^{3} + \left(36 a^{2} + 12 a + 20\right)\cdot 41^{4} +O(41^{5})\)
|
| $r_{ 3 }$ | $=$ |
\( 13 a^{2} + 21 a + \left(38 a^{2} + 23\right)\cdot 41 + \left(10 a^{2} + 37 a + 10\right)\cdot 41^{2} + \left(25 a^{2} + 36 a + 4\right)\cdot 41^{3} + \left(26 a^{2} + 38 a\right)\cdot 41^{4} +O(41^{5})\)
|
| $r_{ 4 }$ | $=$ |
\( 31 a^{2} + 26 a + 36 + \left(35 a^{2} + 11 a + 34\right)\cdot 41 + \left(15 a^{2} + 38 a + 37\right)\cdot 41^{2} + \left(17 a^{2} + 33 a + 5\right)\cdot 41^{3} + \left(4 a^{2} + 11 a + 9\right)\cdot 41^{4} +O(41^{5})\)
|
| $r_{ 5 }$ | $=$ |
\( 17 a^{2} + 14 a + 6 + \left(3 a^{2} + 37 a + 21\right)\cdot 41 + \left(23 a^{2} + 35 a + 39\right)\cdot 41^{2} + \left(18 a^{2} + 36 a + 16\right)\cdot 41^{3} + \left(33 a^{2} + 14 a + 6\right)\cdot 41^{4} +O(41^{5})\)
|
| $r_{ 6 }$ | $=$ |
\( 2 a^{2} + 39 a + 3 + \left(28 a^{2} + 8 a + 16\right)\cdot 41 + \left(32 a^{2} + 23 a + 35\right)\cdot 41^{2} + \left(11 a^{2} + 14 a + 15\right)\cdot 41^{3} + \left(39 a^{2} + 6 a + 32\right)\cdot 41^{4} +O(41^{5})\)
|
| $r_{ 7 }$ | $=$ |
\( 20 a^{2} + 15 a + 32 + \left(36 a^{2} + 9 a + 21\right)\cdot 41 + \left(8 a^{2} + 30 a + 36\right)\cdot 41^{2} + \left(2 a^{2} + 34 a + 29\right)\cdot 41^{3} + \left(19 a^{2} + 30 a + 8\right)\cdot 41^{4} +O(41^{5})\)
|
| $r_{ 8 }$ | $=$ |
\( 8 a^{2} + 17 a + 7 + \left(18 a^{2} + 20 a + 23\right)\cdot 41 + \left(33 a^{2} + 20 a + 8\right)\cdot 41^{2} + \left(11 a^{2} + 33 a + 2\right)\cdot 41^{3} + \left(38 a^{2} + 22 a + 18\right)\cdot 41^{4} +O(41^{5})\)
|
| $r_{ 9 }$ | $=$ |
\( 13 a^{2} + a + 17 + \left(23 a^{2} + 36 a + 34\right)\cdot 41 + \left(40 a^{2} + 3 a + 23\right)\cdot 41^{2} + \left(18 a^{2} + 19 a + 3\right)\cdot 41^{3} + \left(17 a^{2} + 24 a + 23\right)\cdot 41^{4} +O(41^{5})\)
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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 |
| $1$ | $1$ | $()$ | $2$ |
| $9$ | $2$ | $(1,6)(2,3)(4,9)(5,8)$ | $0$ |
| $2$ | $3$ | $(1,5,9)(2,3,7)(4,8,6)$ | $-1$ |
| $2$ | $9$ | $(1,4,2,5,8,3,9,6,7)$ | $-\zeta_{9}^{5} - \zeta_{9}^{2} + \zeta_{9}$ |
| $2$ | $9$ | $(1,2,8,9,7,4,5,3,6)$ | $-\zeta_{9}^{4} + \zeta_{9}^{2} - \zeta_{9}$ |
| $2$ | $9$ | $(1,8,7,5,6,2,9,4,3)$ | $\zeta_{9}^{5} + \zeta_{9}^{4}$ |
The blue line marks the conjugacy class containing complex conjugation.