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Properties

Label 9.3.17256481947.1
Degree $9$
Signature $[3, 3]$
Discriminant $-\,3^{7}\cdot 53^{4}$
Root discriminant $13.72$
Ramified primes $3, 53$
Class number $1$
Class group Trivial
Galois group $((C_3^2:Q_8):C_3):C_2$ (as 9T26)

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![18, -9, -18, 9, 6, -3, 3, -3, -1, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^9 - x^8 - 3*x^7 + 3*x^6 - 3*x^5 + 6*x^4 + 9*x^3 - 18*x^2 - 9*x + 18)
 
gp: K = bnfinit(x^9 - x^8 - 3*x^7 + 3*x^6 - 3*x^5 + 6*x^4 + 9*x^3 - 18*x^2 - 9*x + 18, 1)
 

Normalized defining polynomial

\( x^{9} - x^{8} - 3 x^{7} + 3 x^{6} - 3 x^{5} + 6 x^{4} + 9 x^{3} - 18 x^{2} - 9 x + 18 \)

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

Invariants

Degree:  $9$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[3, 3]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(-17256481947=-\,3^{7}\cdot 53^{4}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $13.72$
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:  $3, 53$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $\frac{1}{3} a^{5} - \frac{1}{3} a^{4}$, $\frac{1}{3} a^{6} - \frac{1}{3} a^{4}$, $\frac{1}{3} a^{7} - \frac{1}{3} a^{4}$, $\frac{1}{129} a^{8} - \frac{4}{129} a^{7} + \frac{3}{43} a^{6} + \frac{19}{129} a^{5} + \frac{26}{129} a^{4} + \frac{19}{43} a^{3} - \frac{11}{43} a^{2} - \frac{16}{43} a + \frac{2}{43}$

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:  $5$
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
magma: [K!f(g): g in Generators(UK)];
 
sage: UK.fundamental_units()
 
gp: K.fu
 
Regulator:  \( 106.533735381 \)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

$AGL(2,3)$ (as 9T26):

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 432
The 11 conjugacy class representatives for $((C_3^2:Q_8):C_3):C_2$
Character table for $((C_3^2:Q_8):C_3):C_2$

Intermediate fields

The extension is primitive: there are no intermediate fields between this field and $\Q$.

Sibling fields

Degree 12 sibling: data not computed
Degree 18 sibling: data not computed
Degree 24 siblings: data not computed
Degree 27 sibling: data not computed
Degree 36 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 ${\href{/LocalNumberField/2.8.0.1}{8} }{,}\,{\href{/LocalNumberField/2.1.0.1}{1} }$ R ${\href{/LocalNumberField/5.6.0.1}{6} }{,}\,{\href{/LocalNumberField/5.3.0.1}{3} }$ ${\href{/LocalNumberField/7.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/11.6.0.1}{6} }{,}\,{\href{/LocalNumberField/11.3.0.1}{3} }$ ${\href{/LocalNumberField/13.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/13.1.0.1}{1} }$ ${\href{/LocalNumberField/17.6.0.1}{6} }{,}\,{\href{/LocalNumberField/17.3.0.1}{3} }$ ${\href{/LocalNumberField/19.6.0.1}{6} }{,}\,{\href{/LocalNumberField/19.2.0.1}{2} }{,}\,{\href{/LocalNumberField/19.1.0.1}{1} }$ ${\href{/LocalNumberField/23.8.0.1}{8} }{,}\,{\href{/LocalNumberField/23.1.0.1}{1} }$ ${\href{/LocalNumberField/29.8.0.1}{8} }{,}\,{\href{/LocalNumberField/29.1.0.1}{1} }$ ${\href{/LocalNumberField/31.6.0.1}{6} }{,}\,{\href{/LocalNumberField/31.2.0.1}{2} }{,}\,{\href{/LocalNumberField/31.1.0.1}{1} }$ ${\href{/LocalNumberField/37.3.0.1}{3} }^{3}$ ${\href{/LocalNumberField/41.6.0.1}{6} }{,}\,{\href{/LocalNumberField/41.3.0.1}{3} }$ ${\href{/LocalNumberField/43.6.0.1}{6} }{,}\,{\href{/LocalNumberField/43.2.0.1}{2} }{,}\,{\href{/LocalNumberField/43.1.0.1}{1} }$ ${\href{/LocalNumberField/47.8.0.1}{8} }{,}\,{\href{/LocalNumberField/47.1.0.1}{1} }$ R ${\href{/LocalNumberField/59.8.0.1}{8} }{,}\,{\href{/LocalNumberField/59.1.0.1}{1} }$

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
$3$$\Q_{3}$$x + 1$$1$$1$$0$Trivial$[\ ]$
3.8.7.2$x^{8} - 3$$8$$1$$7$$QD_{16}$$[\ ]_{8}^{2}$
$53$53.3.0.1$x^{3} - x + 8$$1$$3$$0$$C_3$$[\ ]^{3}$
53.6.4.2$x^{6} - 53 x^{3} + 14045$$3$$2$$4$$S_3\times C_3$$[\ ]_{3}^{6}$

Artin representations

Label Dimension Conductor Defining polynomial of Artin field $G$ Ind $\chi(c)$
* 1.1.1t1.1c1$1$ $1$ $x$ $C_1$ $1$ $1$
1.3.2t1.1c1$1$ $ 3 $ $x^{2} - x + 1$ $C_2$ (as 2T1) $1$ $-1$
2.3_53e2.3t2.1c1$2$ $ 3 \cdot 53^{2}$ $x^{3} - 53$ $S_3$ (as 3T2) $1$ $0$
2.3e2_53e2.24t22.1c1$2$ $ 3^{2} \cdot 53^{2}$ $x^{8} - 4 x^{7} + 7 x^{6} - 7 x^{5} - 2 x^{4} + 11 x^{3} - 14 x^{2} + 8 x - 5$ $\textrm{GL(2,3)}$ (as 8T23) $0$ $0$
2.3e2_53e2.24t22.1c2$2$ $ 3^{2} \cdot 53^{2}$ $x^{8} - 4 x^{7} + 7 x^{6} - 7 x^{5} - 2 x^{4} + 11 x^{3} - 14 x^{2} + 8 x - 5$ $\textrm{GL(2,3)}$ (as 8T23) $0$ $0$
3.3e3_53e2.4t5.1c1$3$ $ 3^{3} \cdot 53^{2}$ $x^{4} - x^{3} - 6 x^{2} + 8 x - 5$ $S_4$ (as 4T5) $1$ $1$
3.3e2_53e2.6t8.1c1$3$ $ 3^{2} \cdot 53^{2}$ $x^{4} - x^{3} - 6 x^{2} + 8 x - 5$ $S_4$ (as 4T5) $1$ $-1$
4.3e4_53e2.8t23.1c1$4$ $ 3^{4} \cdot 53^{2}$ $x^{8} - 4 x^{7} + 7 x^{6} - 7 x^{5} - 2 x^{4} + 11 x^{3} - 14 x^{2} + 8 x - 5$ $\textrm{GL(2,3)}$ (as 8T23) $1$ $0$
* 8.3e7_53e4.9t26.1c1$8$ $ 3^{7} \cdot 53^{4}$ $x^{9} - x^{8} - 3 x^{7} + 3 x^{6} - 3 x^{5} + 6 x^{4} + 9 x^{3} - 18 x^{2} - 9 x + 18$ $((C_3^2:Q_8):C_3):C_2$ (as 9T26) $1$ $2$
8.3e7_53e4.18t157.1c1$8$ $ 3^{7} \cdot 53^{4}$ $x^{9} - x^{8} - 3 x^{7} + 3 x^{6} - 3 x^{5} + 6 x^{4} + 9 x^{3} - 18 x^{2} - 9 x + 18$ $((C_3^2:Q_8):C_3):C_2$ (as 9T26) $1$ $-2$
16.3e14_53e12.24t1334.1c1$16$ $ 3^{14} \cdot 53^{12}$ $x^{9} - x^{8} - 3 x^{7} + 3 x^{6} - 3 x^{5} + 6 x^{4} + 9 x^{3} - 18 x^{2} - 9 x + 18$ $((C_3^2:Q_8):C_3):C_2$ (as 9T26) $1$ $0$

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 *.