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Properties

Label 16.0.64545232525...5376.1
Degree $16$
Signature $[0, 8]$
Discriminant $2^{56}\cdot 173^{4}$
Root discriminant $41.03$
Ramified primes $2, 173$
Class number $20$ (GRH)
Class group $[2, 10]$ (GRH)
Galois group $C_2^4.(C_4\times S_3)$ (as 16T725)

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![4, 0, 224, 0, 1488, 0, 3456, 0, 3604, 0, 1744, 0, 360, 0, 32, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^16 + 32*x^14 + 360*x^12 + 1744*x^10 + 3604*x^8 + 3456*x^6 + 1488*x^4 + 224*x^2 + 4)
 
gp: K = bnfinit(x^16 + 32*x^14 + 360*x^12 + 1744*x^10 + 3604*x^8 + 3456*x^6 + 1488*x^4 + 224*x^2 + 4, 1)
 

Normalized defining polynomial

\( x^{16} + 32 x^{14} + 360 x^{12} + 1744 x^{10} + 3604 x^{8} + 3456 x^{6} + 1488 x^{4} + 224 x^{2} + 4 \)

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

Invariants

Degree:  $16$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[0, 8]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(64545232525865114587365376=2^{56}\cdot 173^{4}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $41.03$
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:  $2, 173$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is not Galois over $\Q$.
This is a CM field.

Integral basis (with respect to field generator \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $\frac{1}{8} a^{8} - \frac{1}{2} a^{4} + \frac{1}{4}$, $\frac{1}{8} a^{9} - \frac{1}{2} a^{5} + \frac{1}{4} a$, $\frac{1}{8} a^{10} - \frac{1}{2} a^{6} + \frac{1}{4} a^{2}$, $\frac{1}{16} a^{11} + \frac{1}{4} a^{7} - \frac{1}{2} a^{4} + \frac{1}{8} a^{3}$, $\frac{1}{16} a^{12} - \frac{1}{2} a^{5} + \frac{1}{8} a^{4} - \frac{1}{2}$, $\frac{1}{16} a^{13} - \frac{1}{2} a^{6} + \frac{1}{8} a^{5} - \frac{1}{2} a$, $\frac{1}{20752} a^{14} + \frac{27}{1297} a^{12} - \frac{319}{10376} a^{10} + \frac{189}{5188} a^{8} - \frac{1}{2} a^{7} + \frac{1253}{10376} a^{6} + \frac{610}{1297} a^{4} - \frac{269}{5188} a^{2} - \frac{595}{2594}$, $\frac{1}{20752} a^{15} + \frac{27}{1297} a^{13} - \frac{319}{10376} a^{11} + \frac{189}{5188} a^{9} + \frac{1253}{10376} a^{7} + \frac{610}{1297} a^{5} - \frac{269}{5188} a^{3} - \frac{595}{2594} a$

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

Class group and class number

$C_{2}\times C_{10}$, which has order $20$ (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:  $7$
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:  \( 193298.889985 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

$C_2^4.(C_4\times S_3)$ (as 16T725):

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 384
The 28 conjugacy class representatives for $C_2^4.(C_4\times S_3)$
Character table for $C_2^4.(C_4\times S_3)$ is not computed

Intermediate fields

\(\Q(\sqrt{2}) \), 4.0.2048.2, 8.8.502125297664.1

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 16 sibling: data not computed
Degree 24 siblings: data not computed
Degree 32 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 ${\href{/LocalNumberField/3.12.0.1}{12} }{,}\,{\href{/LocalNumberField/3.4.0.1}{4} }$ ${\href{/LocalNumberField/5.12.0.1}{12} }{,}\,{\href{/LocalNumberField/5.4.0.1}{4} }$ ${\href{/LocalNumberField/7.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/7.2.0.1}{2} }^{2}{,}\,{\href{/LocalNumberField/7.1.0.1}{1} }^{4}$ ${\href{/LocalNumberField/11.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/13.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/17.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/19.12.0.1}{12} }{,}\,{\href{/LocalNumberField/19.4.0.1}{4} }$ ${\href{/LocalNumberField/23.3.0.1}{3} }^{4}{,}\,{\href{/LocalNumberField/23.1.0.1}{1} }^{4}$ ${\href{/LocalNumberField/29.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/31.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/31.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/37.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/41.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/41.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/43.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/47.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/47.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/53.12.0.1}{12} }{,}\,{\href{/LocalNumberField/53.4.0.1}{4} }$ ${\href{/LocalNumberField/59.12.0.1}{12} }{,}\,{\href{/LocalNumberField/59.4.0.1}{4} }$

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
2Data not computed
$173$173.4.0.1$x^{4} - x + 26$$1$$4$$0$$C_4$$[\ ]^{4}$
173.4.0.1$x^{4} - x + 26$$1$$4$$0$$C_4$$[\ ]^{4}$
173.8.4.1$x^{8} + 1556308 x^{4} - 5177717 x^{2} + 605523647716$$2$$4$$4$$C_4\times C_2$$[\ ]_{2}^{4}$