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Properties

Label 18.18.1417112841...4304.1
Degree $18$
Signature $[18, 0]$
Discriminant $2^{18}\cdot 19^{16}\cdot 37^{4}$
Root discriminant $61.12$
Ramified primes $2, 19, 37$
Class number $1$ (GRH)
Class group Trivial (GRH)
Galois group 18T177

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-1874161, 0, 5470524, 0, -6446621, 0, 3984308, 0, -1411309, 0, 294157, 0, -35671, 0, 2399, 0, -80, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^18 - 80*x^16 + 2399*x^14 - 35671*x^12 + 294157*x^10 - 1411309*x^8 + 3984308*x^6 - 6446621*x^4 + 5470524*x^2 - 1874161)
 
gp: K = bnfinit(x^18 - 80*x^16 + 2399*x^14 - 35671*x^12 + 294157*x^10 - 1411309*x^8 + 3984308*x^6 - 6446621*x^4 + 5470524*x^2 - 1874161, 1)
 

Normalized defining polynomial

\( x^{18} - 80 x^{16} + 2399 x^{14} - 35671 x^{12} + 294157 x^{10} - 1411309 x^{8} + 3984308 x^{6} - 6446621 x^{4} + 5470524 x^{2} - 1874161 \)

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

Invariants

Degree:  $18$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[18, 0]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(141711284133771727403008823394304=2^{18}\cdot 19^{16}\cdot 37^{4}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $61.12$
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:  $2, 19, 37$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $\frac{1}{37} a^{12} - \frac{6}{37} a^{10} - \frac{6}{37} a^{8} - \frac{3}{37} a^{6} + \frac{7}{37} a^{4} - \frac{18}{37} a^{2}$, $\frac{1}{37} a^{13} - \frac{6}{37} a^{11} - \frac{6}{37} a^{9} - \frac{3}{37} a^{7} + \frac{7}{37} a^{5} - \frac{18}{37} a^{3}$, $\frac{1}{1369} a^{14} - \frac{6}{1369} a^{12} + \frac{586}{1369} a^{10} - \frac{521}{1369} a^{8} - \frac{400}{1369} a^{6} + \frac{648}{1369} a^{4} + \frac{15}{37} a^{2}$, $\frac{1}{1369} a^{15} - \frac{6}{1369} a^{13} + \frac{586}{1369} a^{11} - \frac{521}{1369} a^{9} - \frac{400}{1369} a^{7} + \frac{648}{1369} a^{5} + \frac{15}{37} a^{3}$, $\frac{1}{78248100015361937} a^{16} + \frac{16353117708539}{78248100015361937} a^{14} - \frac{130571123747396}{78248100015361937} a^{12} + \frac{3334458578399149}{78248100015361937} a^{10} - \frac{218786346614397}{78248100015361937} a^{8} + \frac{32588184050742162}{78248100015361937} a^{6} + \frac{934033607307394}{2114813513928701} a^{4} - \frac{12929105546451}{57157121998073} a^{2} + \frac{133025320438}{1544787081029}$, $\frac{1}{78248100015361937} a^{17} + \frac{16353117708539}{78248100015361937} a^{15} - \frac{130571123747396}{78248100015361937} a^{13} + \frac{3334458578399149}{78248100015361937} a^{11} - \frac{218786346614397}{78248100015361937} a^{9} + \frac{32588184050742162}{78248100015361937} a^{7} + \frac{934033607307394}{2114813513928701} a^{5} - \frac{12929105546451}{57157121998073} a^{3} + \frac{133025320438}{1544787081029} a$

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:  $17$
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:  \( 16383382024.9 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

18T177:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 576
The 16 conjugacy class representatives for t18n177
Character table for t18n177

Intermediate fields

3.3.361.1, \(\Q(\zeta_{19})^+\)

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

Sibling fields

Degree 12 siblings: data not computed
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 ${\href{/LocalNumberField/3.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/5.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/7.3.0.1}{3} }^{6}$ ${\href{/LocalNumberField/11.3.0.1}{3} }^{6}$ ${\href{/LocalNumberField/13.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/17.9.0.1}{9} }^{2}$ R ${\href{/LocalNumberField/23.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/29.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/31.3.0.1}{3} }^{6}$ R ${\href{/LocalNumberField/41.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/43.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/47.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/53.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/59.9.0.1}{9} }^{2}$

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
2Data not computed
$19$19.9.8.8$x^{9} - 19$$9$$1$$8$$C_9$$[\ ]_{9}$
19.9.8.8$x^{9} - 19$$9$$1$$8$$C_9$$[\ ]_{9}$
37Data not computed