Normalized defining polynomial
\( x^{8} - 32x^{6} + 226x^{4} - 425x^{2} + 225 \)
Invariants
Degree: | $8$ | sage: K.degree()
gp: poldegree(K.pol)
magma: Degree(K);
oscar: degree(K)
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Signature: | $[8, 0]$ | sage: K.signature()
gp: K.sign
magma: Signature(K);
oscar: signature(K)
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Discriminant: | \(670801950625\) \(\medspace = 5^{4}\cdot 181^{4}\) | sage: K.disc()
gp: K.disc
magma: OK := Integers(K); Discriminant(OK);
oscar: OK = ring_of_integers(K); discriminant(OK)
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Root discriminant: | \(30.08\) | 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))
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Galois root discriminant: | $5^{1/2}181^{1/2}\approx 30.083217912982647$ | ||
Ramified primes: | \(5\), \(181\) | sage: K.disc().support()
gp: factor(abs(K.disc))[,1]~
magma: PrimeDivisors(Discriminant(OK));
oscar: prime_divisors(discriminant((OK)))
| |
Discriminant root field: | \(\Q\) | ||
$\card{ \Gal(K/\Q) }$: | $8$ | sage: K.automorphisms()
magma: Automorphisms(K);
oscar: automorphisms(K)
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This field is Galois over $\Q$. | |||
This is not a CM field. |
Integral basis (with respect to field generator \(a\))
$1$, $a$, $a^{2}$, $a^{3}$, $\frac{1}{2}a^{4}-\frac{1}{2}a-\frac{1}{2}$, $\frac{1}{2}a^{5}-\frac{1}{2}a^{2}-\frac{1}{2}a$, $\frac{1}{710}a^{6}-\frac{31}{355}a^{4}-\frac{1}{2}a^{3}+\frac{311}{710}a^{2}-\frac{17}{71}$, $\frac{1}{2130}a^{7}-\frac{31}{1065}a^{5}+\frac{1021}{2130}a^{3}+\frac{179}{426}a-\frac{1}{2}$
Monogenic: | No | |
Index: | Not computed | |
Inessential primes: | $3$ |
Class group and class number
Trivial group, which has order $1$
Unit group
Rank: | $7$ | sage: UK.rank()
gp: K.fu
magma: UnitRank(K);
oscar: rank(UK)
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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)
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Fundamental units: | $\frac{1}{2130}a^{7}-\frac{31}{1065}a^{5}+\frac{1021}{2130}a^{3}-\frac{673}{426}a-\frac{1}{2}$, $\frac{1}{1065}a^{7}+\frac{17}{355}a^{6}-\frac{62}{1065}a^{5}-\frac{1043}{710}a^{4}+\frac{1021}{1065}a^{3}+\frac{3157}{355}a^{2}-\frac{1133}{426}a-\frac{1227}{142}$, $\frac{101}{2130}a^{7}+\frac{11}{355}a^{6}-\frac{3067}{2130}a^{5}-\frac{327}{355}a^{4}+\frac{17921}{2130}a^{3}+\frac{3647}{710}a^{2}-\frac{1504}{213}a-\frac{535}{142}$, $\frac{101}{2130}a^{7}+\frac{6}{355}a^{6}-\frac{3067}{2130}a^{5}-\frac{389}{710}a^{4}+\frac{17921}{2130}a^{3}+\frac{2667}{710}a^{2}-\frac{3221}{426}a-\frac{133}{71}$, $\frac{101}{2130}a^{7}-\frac{11}{355}a^{6}-\frac{3067}{2130}a^{5}+\frac{327}{355}a^{4}+\frac{17921}{2130}a^{3}-\frac{3647}{710}a^{2}-\frac{1504}{213}a+\frac{535}{142}$, $\frac{49}{1065}a^{7}+\frac{27}{355}a^{6}-\frac{2881}{2130}a^{5}-\frac{1573}{710}a^{4}+\frac{7429}{1065}a^{3}+\frac{7919}{710}a^{2}-\frac{814}{213}a-\frac{1055}{142}$, $\frac{89}{2130}a^{7}-\frac{9}{71}a^{6}-\frac{2323}{2130}a^{5}+\frac{477}{142}a^{4}+\frac{5669}{2130}a^{3}-\frac{1125}{142}a^{2}-\frac{683}{426}a+\frac{323}{71}$ | 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: | \( 3663.62694361 \) | sage: K.regulator()
gp: K.reg
magma: Regulator(K);
oscar: regulator(K)
|
Class number formula
\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{8}\cdot(2\pi)^{0}\cdot 3663.62694361 \cdot 1}{2\cdot\sqrt{670801950625}}\cr\approx \mathstrut & 0.572564022810 \end{aligned}\]
Galois group
A solvable group of order 8 |
The 5 conjugacy class representatives for $D_4$ |
Character table for $D_4$ |
Intermediate fields
\(\Q(\sqrt{905}) \), \(\Q(\sqrt{5}) \), \(\Q(\sqrt{181}) \), \(\Q(\sqrt{5}, \sqrt{181})\), 4.4.4525.1 x2, 4.4.163805.1 x2 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Sibling fields
Degree 4 siblings: | 4.4.163805.1, 4.4.4525.1 |
Minimal sibling: | 4.4.4525.1 |
Frobenius cycle types
$p$ | $2$ | $3$ | $5$ | $7$ | $11$ | $13$ | $17$ | $19$ | $23$ | $29$ | $31$ | $37$ | $41$ | $43$ | $47$ | $53$ | $59$ |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Cycle type | ${\href{/padicField/2.4.0.1}{4} }^{2}$ | ${\href{/padicField/3.2.0.1}{2} }^{4}$ | R | ${\href{/padicField/7.4.0.1}{4} }^{2}$ | ${\href{/padicField/11.2.0.1}{2} }^{4}$ | ${\href{/padicField/13.2.0.1}{2} }^{4}$ | ${\href{/padicField/17.4.0.1}{4} }^{2}$ | ${\href{/padicField/19.2.0.1}{2} }^{4}$ | ${\href{/padicField/23.4.0.1}{4} }^{2}$ | ${\href{/padicField/29.2.0.1}{2} }^{4}$ | ${\href{/padicField/31.2.0.1}{2} }^{4}$ | ${\href{/padicField/37.2.0.1}{2} }^{4}$ | ${\href{/padicField/41.2.0.1}{2} }^{4}$ | ${\href{/padicField/43.2.0.1}{2} }^{4}$ | ${\href{/padicField/47.4.0.1}{4} }^{2}$ | ${\href{/padicField/53.4.0.1}{4} }^{2}$ | ${\href{/padicField/59.2.0.1}{2} }^{4}$ |
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 |
---|---|---|---|---|---|---|---|
\(5\) | 5.2.1.1 | $x^{2} + 5$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ |
5.2.1.1 | $x^{2} + 5$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ | |
5.2.1.1 | $x^{2} + 5$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ | |
5.2.1.1 | $x^{2} + 5$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ | |
\(181\) | 181.2.1.1 | $x^{2} + 181$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ |
181.2.1.1 | $x^{2} + 181$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ | |
181.2.1.1 | $x^{2} + 181$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ | |
181.2.1.1 | $x^{2} + 181$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ |
Artin representations
Label | Dimension | Conductor | Artin stem field | $G$ | Ind | $\chi(c)$ | |
---|---|---|---|---|---|---|---|
* | 1.1.1t1.a.a | $1$ | $1$ | \(\Q\) | $C_1$ | $1$ | $1$ |
* | 1.181.2t1.a.a | $1$ | $ 181 $ | \(\Q(\sqrt{181}) \) | $C_2$ (as 2T1) | $1$ | $1$ |
* | 1.5.2t1.a.a | $1$ | $ 5 $ | \(\Q(\sqrt{5}) \) | $C_2$ (as 2T1) | $1$ | $1$ |
* | 1.905.2t1.a.a | $1$ | $ 5 \cdot 181 $ | \(\Q(\sqrt{905}) \) | $C_2$ (as 2T1) | $1$ | $1$ |
*2 | 2.905.4t3.c.a | $2$ | $ 5 \cdot 181 $ | 8.8.670801950625.1 | $D_4$ (as 8T4) | $1$ | $2$ |