Basic invariants
| Dimension: | $1$ |
| Group: | $C_4$ |
| Conductor: | \(16\)\(\medspace = 2^{4} \) |
| Artin field: | Galois closure of \(\Q(\zeta_{16})^+\) |
| Galois orbit size: | $2$ |
| Smallest permutation container: | $C_4$ |
| Parity: | even |
| Dirichlet character: | \(\chi_{16}(5,\cdot)\) |
| Projective image: | $C_1$ |
| Projective field: | Galois closure of \(\Q\) |
Defining polynomial
| $f(x)$ | $=$ |
\( x^{4} - 4x^{2} + 2 \)
|
The roots of $f$ are computed in $\Q_{ 17 }$ to precision 5.
Roots:
| $r_{ 1 }$ | $=$ |
\( 5 + 3\cdot 17 + 14\cdot 17^{2} + 12\cdot 17^{3} + 15\cdot 17^{4} +O(17^{5})\)
|
| $r_{ 2 }$ | $=$ |
\( 8 + 17 + 9\cdot 17^{3} + 15\cdot 17^{4} +O(17^{5})\)
|
| $r_{ 3 }$ | $=$ |
\( 9 + 15\cdot 17 + 16\cdot 17^{2} + 7\cdot 17^{3} + 17^{4} +O(17^{5})\)
|
| $r_{ 4 }$ | $=$ |
\( 12 + 13\cdot 17 + 2\cdot 17^{2} + 4\cdot 17^{3} + 17^{4} +O(17^{5})\)
|
Generators of the action on the roots $r_1, \ldots, r_{ 4 }$
| Cycle notation |
Character values on conjugacy classes
| Size | Order | Action on $r_1, \ldots, r_{ 4 }$ | Character value | Complex conjugation |
| $1$ | $1$ | $()$ | $1$ | ✓ |
| $1$ | $2$ | $(1,4)(2,3)$ | $-1$ | |
| $1$ | $4$ | $(1,3,4,2)$ | $\zeta_{4}$ | |
| $1$ | $4$ | $(1,2,4,3)$ | $-\zeta_{4}$ |