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Properties

Label 16.4.11940778378...0000.1
Degree $16$
Signature $[4, 6]$
Discriminant $2^{24}\cdot 5^{12}\cdot 13^{2}\cdot 29^{7}$
Root discriminant $56.86$
Ramified primes $2, 5, 13, 29$
Class number $2$ (GRH)
Class group $[2]$ (GRH)
Galois group 16T1606

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![4901, 0, 135720, 0, 396952, 0, 228810, 0, 19514, 0, -3640, 0, -367, 0, 10, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^16 + 10*x^14 - 367*x^12 - 3640*x^10 + 19514*x^8 + 228810*x^6 + 396952*x^4 + 135720*x^2 + 4901)
 
gp: K = bnfinit(x^16 + 10*x^14 - 367*x^12 - 3640*x^10 + 19514*x^8 + 228810*x^6 + 396952*x^4 + 135720*x^2 + 4901, 1)
 

Normalized defining polynomial

\( x^{16} + 10 x^{14} - 367 x^{12} - 3640 x^{10} + 19514 x^{8} + 228810 x^{6} + 396952 x^{4} + 135720 x^{2} + 4901 \)

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

Invariants

Degree:  $16$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[4, 6]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(11940778378121216000000000000=2^{24}\cdot 5^{12}\cdot 13^{2}\cdot 29^{7}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $56.86$
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:  $2, 5, 13, 29$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $\frac{1}{2} a^{8} - \frac{1}{2} a^{6} - \frac{1}{2}$, $\frac{1}{2} a^{9} - \frac{1}{2} a^{7} - \frac{1}{2} a$, $\frac{1}{2} a^{10} - \frac{1}{2} a^{6} - \frac{1}{2} a^{2} - \frac{1}{2}$, $\frac{1}{2} a^{11} - \frac{1}{2} a^{7} - \frac{1}{2} a^{3} - \frac{1}{2} a$, $\frac{1}{28} a^{12} - \frac{1}{4} a^{11} + \frac{1}{28} a^{10} - \frac{1}{4} a^{9} - \frac{1}{28} a^{8} - \frac{1}{28} a^{6} + \frac{3}{28} a^{4} + \frac{1}{4} a^{3} + \frac{3}{7} a^{2} + \frac{5}{28}$, $\frac{1}{28} a^{13} - \frac{3}{14} a^{11} + \frac{3}{14} a^{9} - \frac{1}{4} a^{8} + \frac{13}{28} a^{7} - \frac{1}{4} a^{6} + \frac{3}{28} a^{5} - \frac{9}{28} a^{3} - \frac{9}{28} a + \frac{1}{4}$, $\frac{1}{151730318190767027348} a^{14} - \frac{448704540737689491}{75865159095383513674} a^{12} - \frac{2789809777003542899}{75865159095383513674} a^{10} - \frac{1}{4} a^{9} + \frac{486152905080236843}{11671562937751309796} a^{8} - \frac{1}{4} a^{7} + \frac{71773762558600458149}{151730318190767027348} a^{6} - \frac{1160078847689543525}{151730318190767027348} a^{4} + \frac{35751197653805549263}{151730318190767027348} a^{2} + \frac{1}{4} a - \frac{169391370066449035}{833683066982236414}$, $\frac{1}{151730318190767027348} a^{15} - \frac{448704540737689491}{75865159095383513674} a^{13} - \frac{2789809777003542899}{75865159095383513674} a^{11} - \frac{1}{4} a^{10} + \frac{486152905080236843}{11671562937751309796} a^{9} - \frac{1}{4} a^{8} + \frac{71773762558600458149}{151730318190767027348} a^{7} - \frac{1160078847689543525}{151730318190767027348} a^{5} + \frac{35751197653805549263}{151730318190767027348} a^{3} + \frac{1}{4} a^{2} - \frac{169391370066449035}{833683066982236414} a$

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

Class group and class number

$C_{2}$, which has order $2$ (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:  $9$
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:  \( 20796868.1044 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

16T1606:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 4096
The 73 conjugacy class representatives for t16n1606 are not computed
Character table for t16n1606 is not computed

Intermediate fields

\(\Q(\sqrt{5}) \), 4.4.725.1, 8.8.97556000000.1

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

Sibling fields

Degree 16 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 $16$ R ${\href{/LocalNumberField/7.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/7.2.0.1}{2} }^{4}$ ${\href{/LocalNumberField/11.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/11.2.0.1}{2} }^{2}$ R $16$ ${\href{/LocalNumberField/19.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/19.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/23.2.0.1}{2} }^{8}$ R ${\href{/LocalNumberField/31.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/31.2.0.1}{2} }^{2}$ $16$ ${\href{/LocalNumberField/41.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/41.2.0.1}{2} }^{2}$ $16$ $16$ ${\href{/LocalNumberField/53.8.0.1}{8} }^{2}$ ${\href{/LocalNumberField/59.4.0.1}{4} }^{4}$

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
5Data not computed
$13$13.2.0.1$x^{2} - x + 2$$1$$2$$0$$C_2$$[\ ]^{2}$
13.2.0.1$x^{2} - x + 2$$1$$2$$0$$C_2$$[\ ]^{2}$
13.4.0.1$x^{4} + x^{2} - x + 2$$1$$4$$0$$C_4$$[\ ]^{4}$
13.4.0.1$x^{4} + x^{2} - x + 2$$1$$4$$0$$C_4$$[\ ]^{4}$
13.4.2.1$x^{4} + 39 x^{2} + 676$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
$29$29.8.7.3$x^{8} + 58$$8$$1$$7$$C_8:C_2$$[\ ]_{8}^{2}$
29.8.0.1$x^{8} + x^{2} - 3 x + 3$$1$$8$$0$$C_8$$[\ ]^{8}$