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Properties

Label 18.0.66595407341...5371.1
Degree $18$
Signature $[0, 9]$
Discriminant $-\,3^{24}\cdot 11^{9}$
Root discriminant $14.35$
Ramified primes $3, 11$
Class number $1$
Class group Trivial
Galois group $S_3 \times C_3$ (as 18T3)

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![1, -9, 21, 15, 99, 24, 95, -15, 93, 22, 30, 9, -19, 30, -12, -9, 6, -3, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^18 - 3*x^17 + 6*x^16 - 9*x^15 - 12*x^14 + 30*x^13 - 19*x^12 + 9*x^11 + 30*x^10 + 22*x^9 + 93*x^8 - 15*x^7 + 95*x^6 + 24*x^5 + 99*x^4 + 15*x^3 + 21*x^2 - 9*x + 1)
 
gp: K = bnfinit(x^18 - 3*x^17 + 6*x^16 - 9*x^15 - 12*x^14 + 30*x^13 - 19*x^12 + 9*x^11 + 30*x^10 + 22*x^9 + 93*x^8 - 15*x^7 + 95*x^6 + 24*x^5 + 99*x^4 + 15*x^3 + 21*x^2 - 9*x + 1, 1)
 

Normalized defining polynomial

\( x^{18} - 3 x^{17} + 6 x^{16} - 9 x^{15} - 12 x^{14} + 30 x^{13} - 19 x^{12} + 9 x^{11} + 30 x^{10} + 22 x^{9} + 93 x^{8} - 15 x^{7} + 95 x^{6} + 24 x^{5} + 99 x^{4} + 15 x^{3} + 21 x^{2} - 9 x + 1 \)

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

Invariants

Degree:  $18$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[0, 9]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(-665954073415574215371=-\,3^{24}\cdot 11^{9}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $14.35$
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:  $3, 11$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is Galois over $\Q$.
This is not a CM field.

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $a^{14}$, $a^{15}$, $\frac{1}{89} a^{16} + \frac{38}{89} a^{15} + \frac{7}{89} a^{14} + \frac{30}{89} a^{13} + \frac{20}{89} a^{12} - \frac{25}{89} a^{11} + \frac{34}{89} a^{10} + \frac{11}{89} a^{9} - \frac{36}{89} a^{8} + \frac{20}{89} a^{7} + \frac{5}{89} a^{6} + \frac{22}{89} a^{5} - \frac{24}{89} a^{4} + \frac{30}{89} a^{3} - \frac{18}{89} a^{2} + \frac{4}{89} a - \frac{2}{89}$, $\frac{1}{799380057074633} a^{17} + \frac{3135082096965}{799380057074633} a^{16} + \frac{334959792917409}{799380057074633} a^{15} + \frac{297441531811197}{799380057074633} a^{14} - \frac{311235434429336}{799380057074633} a^{13} + \frac{201179720931118}{799380057074633} a^{12} + \frac{51410214957476}{799380057074633} a^{11} + \frac{39313070507555}{799380057074633} a^{10} - \frac{55421972362496}{799380057074633} a^{9} + \frac{29389859408115}{799380057074633} a^{8} + \frac{88439508527638}{799380057074633} a^{7} + \frac{208174571954104}{799380057074633} a^{6} - \frac{266548351642341}{799380057074633} a^{5} - \frac{76450981437252}{799380057074633} a^{4} + \frac{19463085775845}{799380057074633} a^{3} + \frac{182967847446866}{799380057074633} a^{2} + \frac{2924985627632}{8981798394097} a - \frac{252705131540318}{799380057074633}$

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:  $8$
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
magma: [K!f(g): g in Generators(UK)];
 
sage: UK.fundamental_units()
 
gp: K.fu
 
Regulator:  \( 550.447518763 \)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

$C_3\times S_3$ (as 18T3):

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 18
The 9 conjugacy class representatives for $S_3 \times C_3$
Character table for $S_3 \times C_3$

Intermediate fields

\(\Q(\sqrt{-11}) \), 3.1.891.1 x3, \(\Q(\zeta_{9})^+\), 6.0.8732691.5, 6.0.8732691.1, 6.0.107811.1 x2, 9.3.707347971.1 x3

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

Sibling fields

Degree 6 sibling: 6.0.107811.1
Degree 9 sibling: 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 ${\href{/LocalNumberField/2.6.0.1}{6} }^{3}$ R ${\href{/LocalNumberField/5.3.0.1}{3} }^{6}$ ${\href{/LocalNumberField/7.6.0.1}{6} }^{3}$ R ${\href{/LocalNumberField/13.6.0.1}{6} }^{3}$ ${\href{/LocalNumberField/17.2.0.1}{2} }^{9}$ ${\href{/LocalNumberField/19.2.0.1}{2} }^{9}$ ${\href{/LocalNumberField/23.3.0.1}{3} }^{6}$ ${\href{/LocalNumberField/29.6.0.1}{6} }^{3}$ ${\href{/LocalNumberField/31.3.0.1}{3} }^{6}$ ${\href{/LocalNumberField/37.3.0.1}{3} }^{6}$ ${\href{/LocalNumberField/41.6.0.1}{6} }^{3}$ ${\href{/LocalNumberField/43.6.0.1}{6} }^{3}$ ${\href{/LocalNumberField/47.3.0.1}{3} }^{6}$ ${\href{/LocalNumberField/53.3.0.1}{3} }^{6}$ ${\href{/LocalNumberField/59.3.0.1}{3} }^{6}$

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$3.9.12.1$x^{9} + 18 x^{5} + 18 x^{3} + 27 x^{2} + 216$$3$$3$$12$$C_3^2$$[2]^{3}$
3.9.12.1$x^{9} + 18 x^{5} + 18 x^{3} + 27 x^{2} + 216$$3$$3$$12$$C_3^2$$[2]^{3}$
$11$11.6.3.2$x^{6} - 121 x^{2} + 3993$$2$$3$$3$$C_6$$[\ ]_{2}^{3}$
11.6.3.2$x^{6} - 121 x^{2} + 3993$$2$$3$$3$$C_6$$[\ ]_{2}^{3}$
11.6.3.2$x^{6} - 121 x^{2} + 3993$$2$$3$$3$$C_6$$[\ ]_{2}^{3}$