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Properties

Label 18.0.10075281446...4496.2
Degree $18$
Signature $[0, 9]$
Discriminant $-\,2^{18}\cdot 7^{13}\cdot 1583^{3}$
Root discriminant $27.84$
Ramified primes $2, 7, 1583$
Class number $7$ (GRH)
Class group $[7]$ (GRH)
Galois group 18T765

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![11081, 0, 11081, 0, 1729, 0, 890, 0, 2065, 0, 404, 0, -42, 0, 34, 0, 14, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^18 + 14*x^16 + 34*x^14 - 42*x^12 + 404*x^10 + 2065*x^8 + 890*x^6 + 1729*x^4 + 11081*x^2 + 11081)
 
gp: K = bnfinit(x^18 + 14*x^16 + 34*x^14 - 42*x^12 + 404*x^10 + 2065*x^8 + 890*x^6 + 1729*x^4 + 11081*x^2 + 11081, 1)
 

Normalized defining polynomial

\( x^{18} + 14 x^{16} + 34 x^{14} - 42 x^{12} + 404 x^{10} + 2065 x^{8} + 890 x^{6} + 1729 x^{4} + 11081 x^{2} + 11081 \)

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:  \(-100752814466102077897834496=-\,2^{18}\cdot 7^{13}\cdot 1583^{3}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $27.84$
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:  $2, 7, 1583$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $\frac{1}{97} a^{14} + \frac{32}{97} a^{12} + \frac{8}{97} a^{10} + \frac{44}{97} a^{8} - \frac{31}{97} a^{6} + \frac{45}{97} a^{4} - \frac{8}{97} a^{2} + \frac{6}{97}$, $\frac{1}{97} a^{15} + \frac{32}{97} a^{13} + \frac{8}{97} a^{11} + \frac{44}{97} a^{9} - \frac{31}{97} a^{7} + \frac{45}{97} a^{5} - \frac{8}{97} a^{3} + \frac{6}{97} a$, $\frac{1}{34246125116184913} a^{16} - \frac{157199198158527}{34246125116184913} a^{14} + \frac{6693002159485252}{34246125116184913} a^{12} + \frac{3791425395587047}{34246125116184913} a^{10} - \frac{70011588325681}{835271344297193} a^{8} + \frac{7939309679555324}{34246125116184913} a^{6} + \frac{8602233368796930}{34246125116184913} a^{4} + \frac{10002432925566177}{34246125116184913} a^{2} + \frac{14308937722022097}{34246125116184913}$, $\frac{1}{34246125116184913} a^{17} - \frac{157199198158527}{34246125116184913} a^{15} + \frac{6693002159485252}{34246125116184913} a^{13} + \frac{3791425395587047}{34246125116184913} a^{11} - \frac{70011588325681}{835271344297193} a^{9} + \frac{7939309679555324}{34246125116184913} a^{7} + \frac{8602233368796930}{34246125116184913} a^{5} + \frac{10002432925566177}{34246125116184913} a^{3} + \frac{14308937722022097}{34246125116184913} a$

magma: IntegralBasis(K);
 
sage: K.integral_basis()
 
gp: K.zk
 

Class group and class number

$C_{7}$, which has order $7$ (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:  $8$
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 (assuming GRH)
magma: [K!f(g): g in Generators(UK)];
 
sage: UK.fundamental_units()
 
gp: K.fu
 
Regulator:  \( 32675.8821279 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

18T765:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 82944
The 110 conjugacy class representatives for t18n765 are not computed
Character table for t18n765 is not computed

Intermediate fields

\(\Q(\zeta_{7})^+\), 9.3.186238367.1

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 ${\href{/LocalNumberField/3.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/5.12.0.1}{12} }{,}\,{\href{/LocalNumberField/5.6.0.1}{6} }$ R $18$ ${\href{/LocalNumberField/13.6.0.1}{6} }^{3}$ $18$ ${\href{/LocalNumberField/19.12.0.1}{12} }{,}\,{\href{/LocalNumberField/19.3.0.1}{3} }^{2}$ ${\href{/LocalNumberField/23.6.0.1}{6} }{,}\,{\href{/LocalNumberField/23.3.0.1}{3} }^{4}$ ${\href{/LocalNumberField/29.3.0.1}{3} }^{4}{,}\,{\href{/LocalNumberField/29.2.0.1}{2} }^{3}$ ${\href{/LocalNumberField/31.6.0.1}{6} }^{3}$ ${\href{/LocalNumberField/37.12.0.1}{12} }{,}\,{\href{/LocalNumberField/37.3.0.1}{3} }^{2}$ ${\href{/LocalNumberField/41.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/41.2.0.1}{2} }^{5}$ ${\href{/LocalNumberField/43.6.0.1}{6} }{,}\,{\href{/LocalNumberField/43.2.0.1}{2} }^{3}{,}\,{\href{/LocalNumberField/43.1.0.1}{1} }^{6}$ ${\href{/LocalNumberField/47.6.0.1}{6} }^{3}$ ${\href{/LocalNumberField/53.9.0.1}{9} }^{2}$ ${\href{/LocalNumberField/59.12.0.1}{12} }{,}\,{\href{/LocalNumberField/59.3.0.1}{3} }^{2}$

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
2Data not computed
$7$7.6.5.5$x^{6} + 56$$6$$1$$5$$C_6$$[\ ]_{6}$
7.6.4.3$x^{6} + 56 x^{3} + 1323$$3$$2$$4$$C_6$$[\ ]_{3}^{2}$
7.6.4.3$x^{6} + 56 x^{3} + 1323$$3$$2$$4$$C_6$$[\ ]_{3}^{2}$
1583Data not computed