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Properties

Label 38.2.28479148269...8125.1
Degree $38$
Signature $[2, 18]$
Discriminant $5^{37}\cdot 19^{38}$
Root discriminant $91.06$
Ramified primes $5, 19$
Class number Not computed
Class group Not computed
Galois group 38T9

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^38 - 5)
 
gp: K = bnfinit(x^38 - 5, 1)
 

Normalized defining polynomial

\( x^{38} - 5 \)

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

Invariants

Degree:  $38$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[2, 18]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(284791482692749835536885264940522098762203880501401727087795734405517578125=5^{37}\cdot 19^{38}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $91.06$
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:  $5, 19$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $a^{14}$, $a^{15}$, $a^{16}$, $a^{17}$, $a^{18}$, $\frac{1}{2} a^{19} - \frac{1}{2}$, $\frac{1}{2} a^{20} - \frac{1}{2} a$, $\frac{1}{2} a^{21} - \frac{1}{2} a^{2}$, $\frac{1}{2} a^{22} - \frac{1}{2} a^{3}$, $\frac{1}{2} a^{23} - \frac{1}{2} a^{4}$, $\frac{1}{2} a^{24} - \frac{1}{2} a^{5}$, $\frac{1}{2} a^{25} - \frac{1}{2} a^{6}$, $\frac{1}{2} a^{26} - \frac{1}{2} a^{7}$, $\frac{1}{2} a^{27} - \frac{1}{2} a^{8}$, $\frac{1}{2} a^{28} - \frac{1}{2} a^{9}$, $\frac{1}{2} a^{29} - \frac{1}{2} a^{10}$, $\frac{1}{2} a^{30} - \frac{1}{2} a^{11}$, $\frac{1}{2} a^{31} - \frac{1}{2} a^{12}$, $\frac{1}{2} a^{32} - \frac{1}{2} a^{13}$, $\frac{1}{2} a^{33} - \frac{1}{2} a^{14}$, $\frac{1}{2} a^{34} - \frac{1}{2} a^{15}$, $\frac{1}{2} a^{35} - \frac{1}{2} a^{16}$, $\frac{1}{2} a^{36} - \frac{1}{2} a^{17}$, $\frac{1}{2} a^{37} - \frac{1}{2} a^{18}$

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

Class group and class number

Not computed

magma: ClassGroup(K);
 
sage: K.class_group().invariants()
 
gp: K.clgp
 

Unit group

magma: UK, f := UnitGroup(K);
 
sage: UK = K.unit_group()
 
Rank:  $19$
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:  Not computed
magma: [K!f(g): g in Generators(UK)];
 
sage: UK.fundamental_units()
 
gp: K.fu
 
Regulator:  Not computed
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

38T9:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 684
The 38 conjugacy class representatives for t38n9
Character table for t38n9 is not computed

Intermediate fields

\(\Q(\sqrt{5}) \), 19.1.7547072050706152302261272430419921875.1

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

Sibling fields

Degree 38 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 $18^{2}{,}\,{\href{/LocalNumberField/2.2.0.1}{2} }$ $18^{2}{,}\,{\href{/LocalNumberField/3.2.0.1}{2} }$ R ${\href{/LocalNumberField/7.6.0.1}{6} }^{6}{,}\,{\href{/LocalNumberField/7.2.0.1}{2} }$ ${\href{/LocalNumberField/11.3.0.1}{3} }^{12}{,}\,{\href{/LocalNumberField/11.1.0.1}{1} }^{2}$ $18^{2}{,}\,{\href{/LocalNumberField/13.2.0.1}{2} }$ $18^{2}{,}\,{\href{/LocalNumberField/17.2.0.1}{2} }$ R $18^{2}{,}\,{\href{/LocalNumberField/23.2.0.1}{2} }$ $18^{2}{,}\,{\href{/LocalNumberField/29.1.0.1}{1} }^{2}$ ${\href{/LocalNumberField/31.6.0.1}{6} }^{6}{,}\,{\href{/LocalNumberField/31.1.0.1}{1} }^{2}$ ${\href{/LocalNumberField/37.2.0.1}{2} }^{19}$ $18^{2}{,}\,{\href{/LocalNumberField/41.1.0.1}{1} }^{2}$ $18^{2}{,}\,{\href{/LocalNumberField/43.2.0.1}{2} }$ $18^{2}{,}\,{\href{/LocalNumberField/47.2.0.1}{2} }$ $18^{2}{,}\,{\href{/LocalNumberField/53.2.0.1}{2} }$ $18^{2}{,}\,{\href{/LocalNumberField/59.1.0.1}{1} }^{2}$

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
5Data not computed
19Data not computed