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Properties

Label 18.10.8659616134...7136.1
Degree $18$
Signature $[10, 4]$
Discriminant $2^{18}\cdot 3^{6}\cdot 7^{12}\cdot 41^{9}$
Root discriminant $67.59$
Ramified primes $2, 3, 7, 41$
Class number $1$ (GRH)
Class group Trivial (GRH)
Galois group 18T657

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-2624, 0, 5456, 0, 89832, 0, 185481, 0, 70434, 0, -45575, 0, 4366, 0, 142, 0, -32, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^18 - 32*x^16 + 142*x^14 + 4366*x^12 - 45575*x^10 + 70434*x^8 + 185481*x^6 + 89832*x^4 + 5456*x^2 - 2624)
 
gp: K = bnfinit(x^18 - 32*x^16 + 142*x^14 + 4366*x^12 - 45575*x^10 + 70434*x^8 + 185481*x^6 + 89832*x^4 + 5456*x^2 - 2624, 1)
 

Normalized defining polynomial

\( x^{18} - 32 x^{16} + 142 x^{14} + 4366 x^{12} - 45575 x^{10} + 70434 x^{8} + 185481 x^{6} + 89832 x^{4} + 5456 x^{2} - 2624 \)

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

Invariants

Degree:  $18$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[10, 4]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(865961613414533621361938102747136=2^{18}\cdot 3^{6}\cdot 7^{12}\cdot 41^{9}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $67.59$
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:  $2, 3, 7, 41$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $\frac{1}{2} a^{7} - \frac{1}{2} a^{3} - \frac{1}{2} a$, $\frac{1}{4} a^{8} - \frac{1}{4} a^{4} - \frac{1}{4} a^{2}$, $\frac{1}{4} a^{9} - \frac{1}{4} a^{5} - \frac{1}{4} a^{3}$, $\frac{1}{4} a^{10} - \frac{1}{4} a^{6} - \frac{1}{4} a^{4}$, $\frac{1}{4} a^{11} - \frac{1}{4} a^{7} - \frac{1}{4} a^{5}$, $\frac{1}{8} a^{12} - \frac{1}{8} a^{10} - \frac{1}{8} a^{9} - \frac{1}{8} a^{8} - \frac{3}{8} a^{5} - \frac{3}{8} a^{4} - \frac{3}{8} a^{3} - \frac{1}{2} a$, $\frac{1}{8} a^{13} - \frac{1}{8} a^{11} - \frac{1}{8} a^{10} - \frac{1}{8} a^{9} - \frac{3}{8} a^{6} - \frac{3}{8} a^{5} - \frac{3}{8} a^{4} - \frac{1}{2} a^{2}$, $\frac{1}{88} a^{14} - \frac{5}{88} a^{12} - \frac{1}{8} a^{11} + \frac{9}{88} a^{10} - \frac{5}{44} a^{8} + \frac{1}{8} a^{7} - \frac{1}{88} a^{6} - \frac{3}{8} a^{5} + \frac{5}{22} a^{4} - \frac{1}{44} a^{2} - \frac{1}{2} a - \frac{1}{11}$, $\frac{1}{176} a^{15} + \frac{3}{88} a^{13} + \frac{5}{44} a^{11} - \frac{1}{8} a^{10} + \frac{3}{44} a^{9} - \frac{23}{176} a^{7} + \frac{1}{8} a^{6} + \frac{4}{11} a^{5} - \frac{3}{8} a^{4} + \frac{9}{176} a^{3} - \frac{13}{44} a - \frac{1}{2}$, $\frac{1}{28909235578784} a^{16} + \frac{4061116061}{903413611837} a^{14} - \frac{501298389771}{14454617789392} a^{12} - \frac{1}{8} a^{11} - \frac{372296217851}{14454617789392} a^{10} - \frac{377706650407}{28909235578784} a^{8} - \frac{1}{8} a^{7} + \frac{2424196589125}{14454617789392} a^{6} - \frac{3}{8} a^{5} - \frac{8318672751727}{28909235578784} a^{4} + \frac{1}{4} a^{3} - \frac{3592297429785}{7227308894696} a^{2} - \frac{1}{4} a + \frac{304629829968}{903413611837}$, $\frac{1}{57818471157568} a^{17} + \frac{4061116061}{1806827223674} a^{15} + \frac{1305528833903}{28909235578784} a^{13} - \frac{2179123441525}{28909235578784} a^{11} + \frac{6849602244289}{57818471157568} a^{9} - \frac{1}{8} a^{8} + \frac{2424196589125}{28909235578784} a^{7} - \frac{15545981646423}{57818471157568} a^{5} - \frac{3}{8} a^{4} + \frac{1134606269187}{3613654447348} a^{3} - \frac{3}{8} a^{2} + \frac{1512673271773}{3613654447348} a - \frac{1}{2}$

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:  $13$
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:  \( 16125099670.5 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

18T657:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 27648
The 96 conjugacy class representatives for t18n657 are not computed
Character table for t18n657 is not computed

Intermediate fields

\(\Q(\zeta_{7})^+\), 9.9.574470067776192.1

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

Sibling fields

Degree 18 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 ${\href{/LocalNumberField/5.12.0.1}{12} }{,}\,{\href{/LocalNumberField/5.6.0.1}{6} }$ R ${\href{/LocalNumberField/11.6.0.1}{6} }^{3}$ ${\href{/LocalNumberField/13.6.0.1}{6} }{,}\,{\href{/LocalNumberField/13.3.0.1}{3} }^{2}{,}\,{\href{/LocalNumberField/13.1.0.1}{1} }^{6}$ ${\href{/LocalNumberField/17.6.0.1}{6} }^{3}$ ${\href{/LocalNumberField/19.12.0.1}{12} }{,}\,{\href{/LocalNumberField/19.3.0.1}{3} }^{2}$ ${\href{/LocalNumberField/23.3.0.1}{3} }^{6}$ ${\href{/LocalNumberField/29.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/29.2.0.1}{2} }^{3}{,}\,{\href{/LocalNumberField/29.1.0.1}{1} }^{4}$ ${\href{/LocalNumberField/31.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/31.3.0.1}{3} }^{2}$ ${\href{/LocalNumberField/37.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/37.3.0.1}{3} }^{2}$ R ${\href{/LocalNumberField/43.2.0.1}{2} }^{8}{,}\,{\href{/LocalNumberField/43.1.0.1}{1} }^{2}$ ${\href{/LocalNumberField/47.6.0.1}{6} }^{3}$ ${\href{/LocalNumberField/53.6.0.1}{6} }^{3}$ ${\href{/LocalNumberField/59.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/59.3.0.1}{3} }^{2}$

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

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
$2$2.3.0.1$x^{3} - x + 1$$1$$3$$0$$C_3$$[\ ]^{3}$
2.3.0.1$x^{3} - x + 1$$1$$3$$0$$C_3$$[\ ]^{3}$
2.12.18.49$x^{12} + 4 x^{11} - 4 x^{10} - 12 x^{9} - 8 x^{8} + 8 x^{7} + 8 x^{6} + 8 x^{5} - 12 x^{4} - 8 x^{3} + 8 x^{2} - 8$$4$$3$$18$$A_4 \times C_2$$[2, 2, 2]^{3}$
$3$3.6.0.1$x^{6} - x + 2$$1$$6$$0$$C_6$$[\ ]^{6}$
3.12.6.2$x^{12} + 108 x^{6} - 243 x^{2} + 2916$$2$$6$$6$$C_6\times C_2$$[\ ]_{2}^{6}$
$7$7.6.4.3$x^{6} + 56 x^{3} + 1323$$3$$2$$4$$C_6$$[\ ]_{3}^{2}$
7.6.4.3$x^{6} + 56 x^{3} + 1323$$3$$2$$4$$C_6$$[\ ]_{3}^{2}$
7.6.4.3$x^{6} + 56 x^{3} + 1323$$3$$2$$4$$C_6$$[\ ]_{3}^{2}$
41Data not computed