Normalized defining polynomial
\( x^{8} - 2x^{7} + x^{6} + 4x^{5} - 7x^{4} + 4x^{3} + x^{2} - 2x + 1 \)
Invariants
Degree: | $8$ | sage: K.degree()
gp: poldegree(K.pol)
magma: Degree(K);
oscar: degree(K)
| |
Signature: | $[2, 3]$ | sage: K.signature()
gp: K.sign
magma: Signature(K);
oscar: signature(K)
| |
Discriminant: | \(-15167488\) \(\medspace = -\,2^{12}\cdot 7\cdot 23^{2}\) | sage: K.disc()
gp: K.disc
magma: OK := Integers(K); Discriminant(OK);
oscar: OK = ring_of_integers(K); discriminant(OK)
| |
Root discriminant: | \(7.90\) | sage: (K.disc().abs())^(1./K.degree())
gp: abs(K.disc)^(1/poldegree(K.pol))
magma: Abs(Discriminant(OK))^(1/Degree(K));
oscar: (1.0 * dK)^(1/degree(K))
| |
Galois root discriminant: | $2^{3/2}7^{1/2}23^{1/2}\approx 35.888716889852724$ | ||
Ramified primes: | \(2\), \(7\), \(23\) | sage: K.disc().support()
gp: factor(abs(K.disc))[,1]~
magma: PrimeDivisors(Discriminant(OK));
oscar: prime_divisors(discriminant((OK)))
| |
Discriminant root field: | \(\Q(\sqrt{-7}) \) | ||
$\card{ \Aut(K/\Q) }$: | $2$ | sage: K.automorphisms()
magma: Automorphisms(K);
oscar: automorphisms(K)
| |
This field is not Galois over $\Q$. | |||
This is not a CM field. |
Integral basis (with respect to field generator \(a\))
$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$
Monogenic: | Yes | |
Index: | $1$ | |
Inessential primes: | None |
Class group and class number
Trivial group, which has order $1$
Unit group
Rank: | $4$ | sage: UK.rank()
gp: K.fu
magma: UnitRank(K);
oscar: rank(UK)
| |
Torsion generator: | \( -1 \) (order $2$) | sage: UK.torsion_generator()
gp: K.tu[2]
magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K);
oscar: torsion_units_generator(OK)
| |
Fundamental units: | $a^{7}-2a^{6}+a^{5}+4a^{4}-7a^{3}+4a^{2}+a-2$, $a^{6}-a^{5}+4a^{3}-3a^{2}+a+1$, $a^{7}-a^{5}+3a^{4}+a^{3}-2a^{2}+1$, $2a^{7}-3a^{6}+9a^{4}-10a^{3}+a^{2}+5a-2$ | sage: UK.fundamental_units()
gp: K.fu
magma: [K|fUK(g): g in Generators(UK)];
oscar: [K(fUK(a)) for a in gens(UK)]
| |
Regulator: | \( 1.97123980118 \) | sage: K.regulator()
gp: K.reg
magma: Regulator(K);
oscar: regulator(K)
|
Class number formula
\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{2}\cdot(2\pi)^{3}\cdot 1.97123980118 \cdot 1}{2\cdot\sqrt{15167488}}\cr\approx \mathstrut & 0.251103190067 \end{aligned}\]
Galois group
$C_2\wr D_4$ (as 8T35):
A solvable group of order 128 |
The 20 conjugacy class representatives for $C_2 \wr C_2\wr C_2$ |
Character table for $C_2 \wr C_2\wr C_2$ |
Intermediate fields
\(\Q(\sqrt{2}) \), 4.2.1472.2 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Sibling fields
Degree 8 siblings: | data not computed |
Degree 16 siblings: | data not computed |
Degree 32 siblings: | data not computed |
Minimal sibling: | 8.2.4616192.1 |
Frobenius cycle types
$p$ | $2$ | $3$ | $5$ | $7$ | $11$ | $13$ | $17$ | $19$ | $23$ | $29$ | $31$ | $37$ | $41$ | $43$ | $47$ | $53$ | $59$ |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Cycle type | R | ${\href{/padicField/3.4.0.1}{4} }{,}\,{\href{/padicField/3.2.0.1}{2} }^{2}$ | ${\href{/padicField/5.8.0.1}{8} }$ | R | ${\href{/padicField/11.4.0.1}{4} }^{2}$ | ${\href{/padicField/13.4.0.1}{4} }{,}\,{\href{/padicField/13.2.0.1}{2} }^{2}$ | ${\href{/padicField/17.4.0.1}{4} }{,}\,{\href{/padicField/17.2.0.1}{2} }^{2}$ | ${\href{/padicField/19.8.0.1}{8} }$ | R | ${\href{/padicField/29.4.0.1}{4} }^{2}$ | ${\href{/padicField/31.4.0.1}{4} }{,}\,{\href{/padicField/31.2.0.1}{2} }^{2}$ | ${\href{/padicField/37.4.0.1}{4} }^{2}$ | ${\href{/padicField/41.4.0.1}{4} }{,}\,{\href{/padicField/41.2.0.1}{2} }^{2}$ | ${\href{/padicField/43.4.0.1}{4} }^{2}$ | ${\href{/padicField/47.2.0.1}{2} }{,}\,{\href{/padicField/47.1.0.1}{1} }^{6}$ | ${\href{/padicField/53.4.0.1}{4} }^{2}$ | ${\href{/padicField/59.4.0.1}{4} }{,}\,{\href{/padicField/59.2.0.1}{2} }^{2}$ |
In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.
Local algebras for ramified primes
$p$ | Label | Polynomial | $e$ | $f$ | $c$ | Galois group | Slope content |
---|---|---|---|---|---|---|---|
\(2\) | 2.8.12.1 | $x^{8} - 12 x^{7} + 52 x^{6} + 840 x^{5} + 3808 x^{4} + 10224 x^{3} + 17968 x^{2} + 20576 x + 15216$ | $2$ | $4$ | $12$ | $C_4\times C_2$ | $[3]^{4}$ |
\(7\) | 7.2.0.1 | $x^{2} + 6 x + 3$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ |
7.2.1.2 | $x^{2} + 7$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ | |
7.4.0.1 | $x^{4} + 5 x^{2} + 4 x + 3$ | $1$ | $4$ | $0$ | $C_4$ | $[\ ]^{4}$ | |
\(23\) | 23.2.0.1 | $x^{2} + 21 x + 5$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ |
23.2.0.1 | $x^{2} + 21 x + 5$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ | |
23.4.2.1 | $x^{4} + 42 x^{3} + 497 x^{2} + 1176 x + 10467$ | $2$ | $2$ | $2$ | $C_2^2$ | $[\ ]_{2}^{2}$ |
Artin representations
Label | Dimension | Conductor | Artin stem field | $G$ | Ind | $\chi(c)$ | |
---|---|---|---|---|---|---|---|
* | 1.1.1t1.a.a | $1$ | $1$ | \(\Q\) | $C_1$ | $1$ | $1$ |
* | 1.8.2t1.a.a | $1$ | $ 2^{3}$ | \(\Q(\sqrt{2}) \) | $C_2$ (as 2T1) | $1$ | $1$ |
1.184.2t1.b.a | $1$ | $ 2^{3} \cdot 23 $ | \(\Q(\sqrt{-46}) \) | $C_2$ (as 2T1) | $1$ | $-1$ | |
1.23.2t1.a.a | $1$ | $ 23 $ | \(\Q(\sqrt{-23}) \) | $C_2$ (as 2T1) | $1$ | $-1$ | |
1.1288.2t1.a.a | $1$ | $ 2^{3} \cdot 7 \cdot 23 $ | \(\Q(\sqrt{322}) \) | $C_2$ (as 2T1) | $1$ | $1$ | |
1.161.2t1.a.a | $1$ | $ 7 \cdot 23 $ | \(\Q(\sqrt{161}) \) | $C_2$ (as 2T1) | $1$ | $1$ | |
1.7.2t1.a.a | $1$ | $ 7 $ | \(\Q(\sqrt{-7}) \) | $C_2$ (as 2T1) | $1$ | $-1$ | |
1.56.2t1.b.a | $1$ | $ 2^{3} \cdot 7 $ | \(\Q(\sqrt{-14}) \) | $C_2$ (as 2T1) | $1$ | $-1$ | |
2.1288.4t3.e.a | $2$ | $ 2^{3} \cdot 7 \cdot 23 $ | 4.0.207368.2 | $D_{4}$ (as 4T3) | $1$ | $-2$ | |
2.1288.4t3.f.a | $2$ | $ 2^{3} \cdot 7 \cdot 23 $ | 4.4.207368.1 | $D_{4}$ (as 4T3) | $1$ | $2$ | |
2.9016.4t3.n.a | $2$ | $ 2^{3} \cdot 7^{2} \cdot 23 $ | 4.0.207368.1 | $D_{4}$ (as 4T3) | $1$ | $0$ | |
2.56.4t3.b.a | $2$ | $ 2^{3} \cdot 7 $ | 4.0.392.1 | $D_{4}$ (as 4T3) | $1$ | $0$ | |
* | 2.184.4t3.b.a | $2$ | $ 2^{3} \cdot 23 $ | 4.0.4232.1 | $D_{4}$ (as 4T3) | $1$ | $0$ |
2.29624.4t3.d.a | $2$ | $ 2^{3} \cdot 7 \cdot 23^{2}$ | 4.0.207368.3 | $D_{4}$ (as 4T3) | $1$ | $0$ | |
4.207368.8t29.b.a | $4$ | $ 2^{3} \cdot 7^{2} \cdot 23^{2}$ | 8.0.56165208064.4 | $(((C_4 \times C_2): C_2):C_2):C_2$ (as 8T29) | $1$ | $0$ | |
4.5450816.8t35.b.a | $4$ | $ 2^{6} \cdot 7 \cdot 23^{3}$ | 8.2.15167488.1 | $C_2 \wr C_2\wr C_2$ (as 8T35) | $1$ | $0$ | |
4.13271552.8t29.b.a | $4$ | $ 2^{9} \cdot 7^{2} \cdot 23^{2}$ | 8.0.56165208064.4 | $(((C_4 \times C_2): C_2):C_2):C_2$ (as 8T29) | $1$ | $0$ | |
4.504896.8t35.b.a | $4$ | $ 2^{6} \cdot 7^{3} \cdot 23 $ | 8.2.15167488.1 | $C_2 \wr C_2\wr C_2$ (as 8T35) | $1$ | $0$ | |
4.267089984.8t35.b.a | $4$ | $ 2^{6} \cdot 7^{3} \cdot 23^{3}$ | 8.2.15167488.1 | $C_2 \wr C_2\wr C_2$ (as 8T35) | $1$ | $0$ | |
* | 4.10304.8t35.b.a | $4$ | $ 2^{6} \cdot 7 \cdot 23 $ | 8.2.15167488.1 | $C_2 \wr C_2\wr C_2$ (as 8T35) | $1$ | $0$ |