magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![7, -4, 18, -16, 5, -8, 4, 0, 1]);
sage: x = polygen(QQ); K.<a> = NumberField(x^8 + 4*x^6 - 8*x^5 + 5*x^4 - 16*x^3 + 18*x^2 - 4*x + 7)
gp: K = bnfinit(x^8 + 4*x^6 - 8*x^5 + 5*x^4 - 16*x^3 + 18*x^2 - 4*x + 7, 1)
Normalized defining polynomial
\( x^{8} + 4 x^{6} - 8 x^{5} + 5 x^{4} - 16 x^{3} + 18 x^{2} - 4 x + 7 \)
magma: DefiningPolynomial(K);
sage: K.defining_polynomial()
gp: K.pol
Invariants
| Degree: | $8$ | magma: Degree(K);
sage: K.degree()
gp: poldegree(K.pol)
| |
| Signature: | $[0, 4]$ | magma: Signature(K);
sage: K.signature()
gp: K.sign
| |
| Discriminant: | \(642318336=2^{16}\cdot 3^{4}\cdot 11^{2}\) | magma: Discriminant(Integers(K));
sage: K.disc()
gp: K.disc
| |
| Root discriminant: | $12.62$ | magma: Abs(Discriminant(Integers(K)))^(1/Degree(K));
sage: (K.disc().abs())^(1./K.degree())
gp: abs(K.disc)^(1/poldegree(K.pol))
| |
| Ramified primes: | $2, 3, 11$ | magma: PrimeDivisors(Discriminant(Integers(K)));
sage: K.disc().support()
gp: factor(abs(K.disc))[,1]~
| |
| This field is not Galois over $\Q$. | |||
| This is not a CM field. | |||
Integral basis (with respect to field generator \(a\))
$1$, $a$, $a^{2}$, $a^{3}$, $\frac{1}{3} a^{4} - \frac{1}{3} a^{2} - \frac{1}{3} a - \frac{1}{3}$, $\frac{1}{3} a^{5} - \frac{1}{3} a^{3} - \frac{1}{3} a^{2} - \frac{1}{3} a$, $\frac{1}{3} a^{6} - \frac{1}{3} a^{3} + \frac{1}{3} a^{2} - \frac{1}{3} a - \frac{1}{3}$, $\frac{1}{9} a^{7} - \frac{1}{9} a^{6} - \frac{1}{9} a^{5} - \frac{1}{9} a^{4} + \frac{1}{3} a^{3} - \frac{1}{9} a^{2} + \frac{1}{9} a - \frac{2}{9}$
magma: IntegralBasis(K);
sage: K.integral_basis()
gp: K.zk
Class group and class number
Trivial group, which has order $1$
magma: ClassGroup(K);
sage: K.class_group().invariants()
gp: K.clgp
Unit group
magma: UK, f := UnitGroup(K);
sage: UK = K.unit_group()
| Rank: | $3$ | magma: UnitRank(K);
sage: UK.rank()
gp: K.fu
| |
| Torsion generator: | \( \frac{1}{3} a^{4} + \frac{2}{3} a^{2} - \frac{4}{3} a + \frac{2}{3} \) (order $6$) | magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K);
sage: UK.torsion_generator()
gp: K.tu[2]
| |
| Fundamental units: | \( \frac{1}{9} a^{7} - \frac{1}{9} a^{6} + \frac{5}{9} a^{5} - \frac{13}{9} a^{4} + \frac{5}{3} a^{3} - \frac{22}{9} a^{2} + \frac{34}{9} a - \frac{17}{9} \), \( \frac{2}{9} a^{7} + \frac{1}{9} a^{6} + \frac{10}{9} a^{5} - \frac{11}{9} a^{4} + a^{3} - \frac{38}{9} a^{2} + \frac{14}{9} a - \frac{25}{9} \), \( \frac{2}{9} a^{7} + \frac{1}{9} a^{6} + \frac{7}{9} a^{5} - \frac{8}{9} a^{4} - \frac{2}{3} a^{3} - \frac{11}{9} a^{2} - \frac{13}{9} a + \frac{44}{9} \) | magma: [K!f(g): g in Generators(UK)];
sage: UK.fundamental_units()
gp: K.fu
| |
| Regulator: | \( 50.9840234083 \) | magma: Regulator(K);
sage: K.regulator()
gp: K.reg
|
Galois group
$Q_8:C_2^2$ (as 8T22):
magma: GaloisGroup(K);
sage: K.galois_group(type='pari')
gp: polgalois(K.pol)
| A solvable group of order 32 |
| The 17 conjugacy class representatives for $C_2^3 : D_4 $ |
| Character table for $C_2^3 : D_4 $ |
Intermediate fields
| \(\Q(\sqrt{-6}) \), \(\Q(\sqrt{-3}) \), \(\Q(\sqrt{2}) \), \(\Q(\sqrt{2}, \sqrt{-3})\) |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Sibling fields
| Galois closure: | data not computed |
| Degree 8 siblings: | data not computed |
| Degree 16 siblings: | data not computed |
Frobenius cycle types
| $p$ | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | 37 | 41 | 43 | 47 | 53 | 59 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cycle type | R | R | ${\href{/LocalNumberField/5.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/7.2.0.1}{2} }^{2}{,}\,{\href{/LocalNumberField/7.1.0.1}{1} }^{4}$ | R | ${\href{/LocalNumberField/13.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/17.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/19.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/23.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/29.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/31.2.0.1}{2} }^{2}{,}\,{\href{/LocalNumberField/31.1.0.1}{1} }^{4}$ | ${\href{/LocalNumberField/37.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/41.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/43.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/47.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/53.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/59.2.0.1}{2} }^{4}$ |
In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.
magma: p := 7; // to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
magma: idealfactors := Factorization(p*Integers(K)); // get the data
magma: [<primefactor[2], Valuation(Norm(primefactor[1]), p)> : primefactor in idealfactors];
sage: p = 7; # to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
sage: [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
gp: p = 7; \\ to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
gp: idealfactors = idealprimedec(K, p); \\ get the data
gp: vector(length(idealfactors), j, [idealfactors[j][3], idealfactors[j][4]])
Local algebras for ramified primes
| $p$ | Label | Polynomial | $e$ | $f$ | $c$ | Galois group | Slope content |
|---|---|---|---|---|---|---|---|
| $2$ | 2.8.16.16 | $x^{8} + 2 x^{6} + 4 x^{5} + 6 x^{4} + 8 x^{3} + 4$ | $4$ | $2$ | $16$ | $D_4\times C_2$ | $[2, 2, 3]^{2}$ |
| $3$ | 3.4.2.1 | $x^{4} + 9 x^{2} + 36$ | $2$ | $2$ | $2$ | $C_2^2$ | $[\ ]_{2}^{2}$ |
| 3.4.2.1 | $x^{4} + 9 x^{2} + 36$ | $2$ | $2$ | $2$ | $C_2^2$ | $[\ ]_{2}^{2}$ | |
| $11$ | 11.2.0.1 | $x^{2} - x + 7$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ |
| 11.2.0.1 | $x^{2} - x + 7$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ | |
| 11.4.2.1 | $x^{4} + 143 x^{2} + 5929$ | $2$ | $2$ | $2$ | $C_2^2$ | $[\ ]_{2}^{2}$ |
Artin representations
| Label | Dimension | Conductor | Defining polynomial of Artin field | $G$ | Ind | $\chi(c)$ | |
|---|---|---|---|---|---|---|---|
| * | 1.1.1t1.1c1 | $1$ | $1$ | $x$ | $C_1$ | $1$ | $1$ |
| 1.2e2_3.2t1.1c1 | $1$ | $ 2^{2} \cdot 3 $ | $x^{2} - 3$ | $C_2$ (as 2T1) | $1$ | $1$ | |
| 1.2e3_3_11.2t1.1c1 | $1$ | $ 2^{3} \cdot 3 \cdot 11 $ | $x^{2} - 66$ | $C_2$ (as 2T1) | $1$ | $1$ | |
| 1.2e3_11.2t1.1c1 | $1$ | $ 2^{3} \cdot 11 $ | $x^{2} - 22$ | $C_2$ (as 2T1) | $1$ | $1$ | |
| 1.2e3.2t1.2c1 | $1$ | $ 2^{3}$ | $x^{2} + 2$ | $C_2$ (as 2T1) | $1$ | $-1$ | |
| * | 1.2e3_3.2t1.2c1 | $1$ | $ 2^{3} \cdot 3 $ | $x^{2} + 6$ | $C_2$ (as 2T1) | $1$ | $-1$ |
| 1.11.2t1.1c1 | $1$ | $ 11 $ | $x^{2} - x + 3$ | $C_2$ (as 2T1) | $1$ | $-1$ | |
| 1.2e2_3_11.2t1.1c1 | $1$ | $ 2^{2} \cdot 3 \cdot 11 $ | $x^{2} + 33$ | $C_2$ (as 2T1) | $1$ | $-1$ | |
| 1.2e3_11.2t1.2c1 | $1$ | $ 2^{3} \cdot 11 $ | $x^{2} + 22$ | $C_2$ (as 2T1) | $1$ | $-1$ | |
| 1.2e3_3_11.2t1.2c1 | $1$ | $ 2^{3} \cdot 3 \cdot 11 $ | $x^{2} + 66$ | $C_2$ (as 2T1) | $1$ | $-1$ | |
| 1.2e2.2t1.1c1 | $1$ | $ 2^{2}$ | $x^{2} + 1$ | $C_2$ (as 2T1) | $1$ | $-1$ | |
| * | 1.3.2t1.1c1 | $1$ | $ 3 $ | $x^{2} - x + 1$ | $C_2$ (as 2T1) | $1$ | $-1$ |
| 1.3_11.2t1.1c1 | $1$ | $ 3 \cdot 11 $ | $x^{2} - x - 8$ | $C_2$ (as 2T1) | $1$ | $1$ | |
| 1.2e2_11.2t1.1c1 | $1$ | $ 2^{2} \cdot 11 $ | $x^{2} - 11$ | $C_2$ (as 2T1) | $1$ | $1$ | |
| 1.2e3_3.2t1.1c1 | $1$ | $ 2^{3} \cdot 3 $ | $x^{2} - 6$ | $C_2$ (as 2T1) | $1$ | $1$ | |
| * | 1.2e3.2t1.1c1 | $1$ | $ 2^{3}$ | $x^{2} - 2$ | $C_2$ (as 2T1) | $1$ | $1$ |
| * | 4.2e10_3e2_11e2.8t22.4c1 | $4$ | $ 2^{10} \cdot 3^{2} \cdot 11^{2}$ | $x^{8} + 4 x^{6} - 8 x^{5} + 5 x^{4} - 16 x^{3} + 18 x^{2} - 4 x + 7$ | $C_2^3 : D_4 $ (as 8T22) | $1$ | $0$ |
Data is given for all irreducible
representations of the Galois group for the Galois closure
of this field. Those marked with * are summands in the
permutation representation coming from this field. Representations
which appear with multiplicity greater than one are indicated
by exponents on the *.