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Properties

Label 9.9.436625333178768721.1
Degree $9$
Signature $[9, 0]$
Discriminant $13^{6}\cdot 67^{6}$
Root discriminant $91.20$
Ramified primes $13, 67$
Class number $1$ (GRH)
Class group Trivial (GRH)
Galois group $C_3^2$ (as 9T2)

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-1000, 23356, -9720, -12695, 1600, 1843, -30, -80, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^9 - 80*x^7 - 30*x^6 + 1843*x^5 + 1600*x^4 - 12695*x^3 - 9720*x^2 + 23356*x - 1000)
 
gp: K = bnfinit(x^9 - 80*x^7 - 30*x^6 + 1843*x^5 + 1600*x^4 - 12695*x^3 - 9720*x^2 + 23356*x - 1000, 1)
 

Normalized defining polynomial

\( x^{9} - 80 x^{7} - 30 x^{6} + 1843 x^{5} + 1600 x^{4} - 12695 x^{3} - 9720 x^{2} + 23356 x - 1000 \)

magma: DefiningPolynomial(K);
 
sage: K.defining_polynomial()
 
gp: K.pol
 

Invariants

Degree:  $9$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[9, 0]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(436625333178768721=13^{6}\cdot 67^{6}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $91.20$
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:  $13, 67$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is Galois and abelian over $\Q$.
Conductor:  \(871=13\cdot 67\)
Dirichlet character group:    $\lbrace$$\chi_{871}(640,·)$, $\chi_{871}(1,·)$, $\chi_{871}(68,·)$, $\chi_{871}(230,·)$, $\chi_{871}(833,·)$, $\chi_{871}(841,·)$, $\chi_{871}(269,·)$, $\chi_{871}(29,·)$, $\chi_{871}(573,·)$$\rbrace$
This is not a CM field.

Integral basis (with respect to field generator \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $\frac{1}{2} a^{4} - \frac{1}{2} a^{2} - \frac{1}{2} a$, $\frac{1}{10} a^{5} - \frac{1}{2} a^{3} - \frac{1}{2} a^{2} + \frac{2}{5} a$, $\frac{1}{30} a^{6} - \frac{1}{30} a^{5} + \frac{1}{6} a^{4} - \frac{1}{3} a^{3} - \frac{11}{30} a^{2} - \frac{2}{15} a + \frac{1}{3}$, $\frac{1}{150} a^{7} - \frac{1}{75} a^{6} - \frac{1}{50} a^{5} + \frac{1}{10} a^{4} - \frac{8}{75} a^{3} + \frac{26}{75} a^{2} + \frac{4}{75} a + \frac{1}{3}$, $\frac{1}{168550500} a^{8} - \frac{2899}{28091750} a^{7} - \frac{209936}{42137625} a^{6} - \frac{601447}{84275250} a^{5} + \frac{134893}{56183500} a^{4} - \frac{2674571}{28091750} a^{3} - \frac{26868817}{56183500} a^{2} - \frac{23413513}{84275250} a - \frac{11064}{112367}$

magma: IntegralBasis(K);
 
sage: K.integral_basis()
 
gp: K.zk
 

Class group and class number

Trivial group, which has order $1$ (assuming GRH)

magma: ClassGroup(K);
 
sage: K.class_group().invariants()
 
gp: K.clgp
 

Unit group

magma: UK, f := UnitGroup(K);
 
sage: UK = K.unit_group()
 
Rank:  $8$
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:  Units are too long to display, but can be downloaded with other data for this field from 'Stored data to gp' link to the right (assuming GRH)
magma: [K!f(g): g in Generators(UK)];
 
sage: UK.fundamental_units()
 
gp: K.fu
 
Regulator:  \( 4402654.649 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

$C_3^2$ (as 9T2):

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
An abelian group of order 9
The 9 conjugacy class representatives for $C_3^2$
Character table for $C_3^2$

Intermediate fields

3.3.758641.2, 3.3.758641.1, 3.3.4489.1, 3.3.169.1

Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.

Frobenius cycle types

$p$ 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59
Cycle type ${\href{/LocalNumberField/2.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/3.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/5.1.0.1}{1} }^{9}$ ${\href{/LocalNumberField/7.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/11.3.0.1}{3} }^{3}$ R ${\href{/LocalNumberField/17.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/19.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/23.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/29.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/31.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/37.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/41.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/43.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/47.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/53.1.0.1}{1} }^{9}$ ${\href{/LocalNumberField/59.3.0.1}{3} }^{3}$

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

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
$13$13.9.6.1$x^{9} + 234 x^{6} + 16900 x^{3} + 474552$$3$$3$$6$$C_3^2$$[\ ]_{3}^{3}$
$67$67.9.6.1$x^{9} + 3216 x^{6} + 3443063 x^{3} + 1231925248$$3$$3$$6$$C_3^2$$[\ ]_{3}^{3}$