magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![50625, 0, 24975, 0, 3472, 0, 111, 0, 1]);
sage: x = polygen(QQ); K.<a> = NumberField(x^8 + 111*x^6 + 3472*x^4 + 24975*x^2 + 50625)
gp: K = bnfinit(x^8 + 111*x^6 + 3472*x^4 + 24975*x^2 + 50625, 1)
Normalized defining polynomial
\( x^{8} + 111 x^{6} + 3472 x^{4} + 24975 x^{2} + 50625 \)
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: | \(5523706320932881=37^{4}\cdot 233^{4}\) | magma: Discriminant(Integers(K));
sage: K.disc()
gp: K.disc
| |
| Root discriminant: | $92.85$ | 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: | $37, 233$ | magma: PrimeDivisors(Discriminant(Integers(K)));
sage: K.disc().support()
gp: factor(abs(K.disc))[,1]~
| |
| This field is Galois over $\Q$. | |||
| This is a CM field. | |||
Integral basis (with respect to field generator \(a\))
$1$, $a$, $a^{2}$, $\frac{1}{2} a^{3} - \frac{1}{2}$, $\frac{1}{2} a^{4} - \frac{1}{2} a$, $\frac{1}{30} a^{5} + \frac{1}{5} a^{3} - \frac{1}{2} a^{2} - \frac{4}{15} a$, $\frac{1}{12600} a^{6} + \frac{2}{75} a^{4} - \frac{101}{450} a^{2} - \frac{1}{2} a + \frac{27}{56}$, $\frac{1}{378000} a^{7} - \frac{1}{25200} a^{6} - \frac{71}{4500} a^{5} + \frac{71}{300} a^{4} - \frac{1901}{13500} a^{3} + \frac{101}{900} a^{2} - \frac{271}{560} a + \frac{29}{112}$
magma: IntegralBasis(K);
sage: K.integral_basis()
gp: K.zk
Class group and class number
$C_{9}\times C_{9}$, which has order $81$
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: | \( -1 \) (order $2$) | magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K);
sage: UK.torsion_generator()
gp: K.tu[2]
| |
| Fundamental units: | \( \frac{3}{700} a^{6} + \frac{11}{25} a^{4} + \frac{297}{25} a^{2} + \frac{1093}{28} \), \( \frac{17}{1000} a^{7} + \frac{709}{750} a^{5} + \frac{2531}{250} a^{3} + \frac{3553}{120} a \), \( \frac{203}{5400} a^{7} + \frac{1139}{450} a^{5} + \frac{24869}{1350} a^{3} + \frac{4261}{120} a \) | magma: [K!f(g): g in Generators(UK)];
sage: UK.fundamental_units()
gp: K.fu
| |
| Regulator: | \( 2867.9042456 \) | magma: Regulator(K);
sage: K.regulator()
gp: K.reg
|
Galois group
magma: GaloisGroup(K);
sage: K.galois_group(type='pari')
gp: polgalois(K.pol)
| A solvable group of order 8 |
| The 5 conjugacy class representatives for $D_4$ |
| Character table for $D_4$ |
Intermediate fields
| \(\Q(\sqrt{8621}) \), \(\Q(\sqrt{233}) \), \(\Q(\sqrt{37}) \), \(\Q(\sqrt{37}, \sqrt{233})\), 4.0.2008693.1 x2, 4.0.318977.1 x2 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Sibling fields
| Degree 4 siblings: | 4.0.318977.1, 4.0.2008693.1 |
Frobenius cycle types
| $p$ | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | 37 | 41 | 43 | 47 | 53 | 59 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cycle type | ${\href{/LocalNumberField/2.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/3.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/5.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/7.1.0.1}{1} }^{8}$ | ${\href{/LocalNumberField/11.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/13.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/17.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/19.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/23.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/29.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/31.2.0.1}{2} }^{4}$ | R | ${\href{/LocalNumberField/41.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/43.4.0.1}{4} }^{2}$ | ${\href{/LocalNumberField/47.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/53.2.0.1}{2} }^{4}$ | ${\href{/LocalNumberField/59.4.0.1}{4} }^{2}$ |
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 |
|---|---|---|---|---|---|---|---|
| $37$ | 37.4.2.1 | $x^{4} + 333 x^{2} + 34225$ | $2$ | $2$ | $2$ | $C_2^2$ | $[\ ]_{2}^{2}$ |
| 37.4.2.1 | $x^{4} + 333 x^{2} + 34225$ | $2$ | $2$ | $2$ | $C_2^2$ | $[\ ]_{2}^{2}$ | |
| 233 | Data not computed | ||||||
Artin representations
| Label | Dimension | Conductor | Defining polynomial of Artin field | $G$ | Ind | $\chi(c)$ | |
|---|---|---|---|---|---|---|---|
| * | 1.1.1t1.1c1 | $1$ | $1$ | $x$ | $C_1$ | $1$ | $1$ |
| * | 1.37.2t1.1c1 | $1$ | $ 37 $ | $x^{2} - x - 9$ | $C_2$ (as 2T1) | $1$ | $1$ |
| * | 1.233.2t1.1c1 | $1$ | $ 233 $ | $x^{2} - x - 58$ | $C_2$ (as 2T1) | $1$ | $1$ |
| * | 1.37_233.2t1.1c1 | $1$ | $ 37 \cdot 233 $ | $x^{2} - x - 2155$ | $C_2$ (as 2T1) | $1$ | $1$ |
| *2 | 2.37_233.4t3.3c1 | $2$ | $ 37 \cdot 233 $ | $x^{8} + 111 x^{6} + 3472 x^{4} + 24975 x^{2} + 50625$ | $D_4$ (as 8T4) | $1$ | $-2$ |
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 *.