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Properties

Label 18.12.9462214702...2608.2
Degree $18$
Signature $[12, 3]$
Discriminant $-\,2^{24}\cdot 3^{6}\cdot 7^{13}\cdot 41^{8}$
Root discriminant $77.19$
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![16807, 0, -93639, 0, 172382, 0, -100465, 0, -17547, 0, 17021, 0, -313, 0, -270, 0, 2, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^18 + 2*x^16 - 270*x^14 - 313*x^12 + 17021*x^10 - 17547*x^8 - 100465*x^6 + 172382*x^4 - 93639*x^2 + 16807)
 
gp: K = bnfinit(x^18 + 2*x^16 - 270*x^14 - 313*x^12 + 17021*x^10 - 17547*x^8 - 100465*x^6 + 172382*x^4 - 93639*x^2 + 16807, 1)
 

Normalized defining polynomial

\( x^{18} + 2 x^{16} - 270 x^{14} - 313 x^{12} + 17021 x^{10} - 17547 x^{8} - 100465 x^{6} + 172382 x^{4} - 93639 x^{2} + 16807 \)

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

Invariants

Degree:  $18$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[12, 3]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(-9462214702675879570003616342212608=-\,2^{24}\cdot 3^{6}\cdot 7^{13}\cdot 41^{8}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $77.19$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $\frac{1}{3} a^{10} + \frac{1}{3} a^{2} + \frac{1}{3}$, $\frac{1}{3} a^{11} + \frac{1}{3} a^{3} + \frac{1}{3} a$, $\frac{1}{3} a^{12} + \frac{1}{3} a^{4} + \frac{1}{3} a^{2}$, $\frac{1}{3} a^{13} + \frac{1}{3} a^{5} + \frac{1}{3} a^{3}$, $\frac{1}{63} a^{14} - \frac{5}{63} a^{12} + \frac{10}{63} a^{10} + \frac{10}{21} a^{8} - \frac{17}{63} a^{6} + \frac{2}{63} a^{4} - \frac{1}{63} a^{2} + \frac{1}{9}$, $\frac{1}{882} a^{15} - \frac{47}{882} a^{13} - \frac{1}{6} a^{12} + \frac{73}{882} a^{11} - \frac{137}{294} a^{9} - \frac{1}{2} a^{8} - \frac{40}{441} a^{7} + \frac{169}{441} a^{5} + \frac{1}{3} a^{4} + \frac{83}{882} a^{3} + \frac{1}{3} a^{2} - \frac{5}{18} a - \frac{1}{2}$, $\frac{1}{195875625657384414} a^{16} + \frac{281631127113199}{65291875219128138} a^{14} - \frac{1}{6} a^{13} - \frac{636855674352715}{65291875219128138} a^{12} - \frac{30763560466312987}{195875625657384414} a^{10} - \frac{1}{2} a^{9} - \frac{38773322574544360}{97937812828692207} a^{8} - \frac{24697960056634423}{97937812828692207} a^{6} + \frac{1}{3} a^{5} - \frac{5286138391296229}{65291875219128138} a^{4} + \frac{1}{3} a^{3} - \frac{1888327988491531}{3997461748109886} a^{2} - \frac{1}{2} a + \frac{8165680175356}{285532982007849}$, $\frac{1}{1371129379601690898} a^{17} - \frac{354837538129346}{685564689800845449} a^{15} - \frac{1}{126} a^{14} - \frac{62360737586661488}{685564689800845449} a^{13} + \frac{5}{126} a^{12} - \frac{72123528935494042}{685564689800845449} a^{11} + \frac{11}{126} a^{10} - \frac{613872763020498425}{1371129379601690898} a^{9} + \frac{11}{42} a^{8} - \frac{17598983045565253}{76173854422316161} a^{7} - \frac{23}{63} a^{6} + \frac{242199948787427287}{1371129379601690898} a^{5} - \frac{1}{63} a^{4} - \frac{251198700018983}{1554568457598289} a^{3} - \frac{41}{126} a^{2} - \frac{2199218077007}{571065964015698} a - \frac{7}{18}$

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:  $14$
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:  \( 55060544445.7 \) (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 ${\href{/LocalNumberField/5.6.0.1}{6} }^{3}$ R ${\href{/LocalNumberField/11.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/11.3.0.1}{3} }^{2}$ ${\href{/LocalNumberField/13.3.0.1}{3} }^{4}{,}\,{\href{/LocalNumberField/13.2.0.1}{2} }^{3}$ ${\href{/LocalNumberField/17.12.0.1}{12} }{,}\,{\href{/LocalNumberField/17.3.0.1}{3} }^{2}$ ${\href{/LocalNumberField/19.12.0.1}{12} }{,}\,{\href{/LocalNumberField/19.3.0.1}{3} }^{2}$ ${\href{/LocalNumberField/23.3.0.1}{3} }^{6}$ ${\href{/LocalNumberField/29.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/29.2.0.1}{2} }^{4}{,}\,{\href{/LocalNumberField/29.1.0.1}{1} }^{2}$ ${\href{/LocalNumberField/31.12.0.1}{12} }{,}\,{\href{/LocalNumberField/31.3.0.1}{3} }^{2}$ ${\href{/LocalNumberField/37.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/37.3.0.1}{3} }^{2}$ R ${\href{/LocalNumberField/43.4.0.1}{4} }{,}\,{\href{/LocalNumberField/43.2.0.1}{2} }^{5}{,}\,{\href{/LocalNumberField/43.1.0.1}{1} }^{4}$ ${\href{/LocalNumberField/47.6.0.1}{6} }{,}\,{\href{/LocalNumberField/47.3.0.1}{3} }^{4}$ ${\href{/LocalNumberField/53.12.0.1}{12} }{,}\,{\href{/LocalNumberField/53.6.0.1}{6} }$ ${\href{/LocalNumberField/59.6.0.1}{6} }{,}\,{\href{/LocalNumberField/59.3.0.1}{3} }^{4}$

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}$
2.12.24.233$x^{12} + 44 x^{11} + 14 x^{10} + 36 x^{9} - 50 x^{8} - 48 x^{6} + 64 x^{5} - 60 x^{4} + 48 x^{3} + 24 x^{2} - 48 x + 56$$4$$3$$24$12T58$[2, 2, 2, 3, 3]^{3}$
$3$3.6.0.1$x^{6} - x + 2$$1$$6$$0$$C_6$$[\ ]^{6}$
3.6.3.1$x^{6} - 6 x^{4} + 9 x^{2} - 27$$2$$3$$3$$C_6$$[\ ]_{2}^{3}$
3.6.3.1$x^{6} - 6 x^{4} + 9 x^{2} - 27$$2$$3$$3$$C_6$$[\ ]_{2}^{3}$
$7$7.6.5.2$x^{6} - 7$$6$$1$$5$$C_6$$[\ ]_{6}$
7.12.8.1$x^{12} - 63 x^{9} + 637 x^{6} + 6174 x^{3} + 300125$$3$$4$$8$$C_{12}$$[\ ]_{3}^{4}$
41Data not computed