Basic invariants
| Dimension: | $2$ |
| Group: | $D_{5}$ |
| Conductor: | \(2855\)\(\medspace = 5 \cdot 571 \) |
| Frobenius-Schur indicator: | $1$ |
| Root number: | $1$ |
| Artin stem field: | Galois closure of 5.1.8151025.1 |
| Galois orbit size: | $2$ |
| Smallest permutation container: | $D_{5}$ |
| Parity: | odd |
| Determinant: | 1.2855.2t1.a.a |
| Projective image: | $D_5$ |
| Projective stem field: | Galois closure of 5.1.8151025.1 |
Defining polynomial
| $f(x)$ | $=$ |
\( x^{5} - 2x^{4} + 8x^{3} + x^{2} + 10x - 5 \)
|
The roots of $f$ are computed in an extension of $\Q_{ 13 }$ to precision 6.
Minimal polynomial of a generator $a$ of $K$ over $\mathbb{Q}_{ 13 }$:
\( x^{2} + 12x + 2 \)
Roots:
| $r_{ 1 }$ | $=$ |
\( 1 + 11\cdot 13 + 7\cdot 13^{2} + 5\cdot 13^{3} + 8\cdot 13^{4} + 3\cdot 13^{5} +O(13^{6})\)
|
| $r_{ 2 }$ | $=$ |
\( 10 a + 12 + 5\cdot 13 + 12 a\cdot 13^{2} + \left(12 a + 2\right)\cdot 13^{3} + 8\cdot 13^{4} + a\cdot 13^{5} +O(13^{6})\)
|
| $r_{ 3 }$ | $=$ |
\( 10 a + 11 + \left(6 a + 7\right)\cdot 13 + \left(12 a + 6\right)\cdot 13^{2} + \left(5 a + 4\right)\cdot 13^{3} + \left(12 a + 3\right)\cdot 13^{4} + \left(3 a + 8\right)\cdot 13^{5} +O(13^{6})\)
|
| $r_{ 4 }$ | $=$ |
\( 3 a + 9 + \left(12 a + 9\right)\cdot 13 + 11\cdot 13^{2} + 2\cdot 13^{3} + \left(12 a + 9\right)\cdot 13^{4} + 11 a\cdot 13^{5} +O(13^{6})\)
|
| $r_{ 5 }$ | $=$ |
\( 3 a + 8 + \left(6 a + 4\right)\cdot 13 + 12\cdot 13^{2} + \left(7 a + 10\right)\cdot 13^{3} + 9\cdot 13^{4} + \left(9 a + 12\right)\cdot 13^{5} +O(13^{6})\)
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Generators of the action on the roots $r_1, \ldots, r_{ 5 }$
| Cycle notation |
Character values on conjugacy classes
| Size | Order | Action on $r_1, \ldots, r_{ 5 }$ | Character value |
| $1$ | $1$ | $()$ | $2$ |
| $5$ | $2$ | $(1,3)(2,5)$ | $0$ |
| $2$ | $5$ | $(1,5,4,2,3)$ | $\zeta_{5}^{3} + \zeta_{5}^{2}$ |
| $2$ | $5$ | $(1,4,3,5,2)$ | $-\zeta_{5}^{3} - \zeta_{5}^{2} - 1$ |
The blue line marks the conjugacy class containing complex conjugation.