↑

Properties

Label 16.0.14958734309...296.12
Degree $16$
Signature $[0, 8]$
Discriminant $2^{48}\cdot 3^{12}$
Root discriminant $18.24$
Ramified primes $2, 3$
Class number $2$
Class group $[2]$
Galois group $C_2^2:D_4$ (as 16T43)

Related objects

Downloads

Learn more about

Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![25, 80, 204, 344, 396, 240, 24, -128, -72, 0, 60, 24, 8, -8, 0, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^16 - 8*x^13 + 8*x^12 + 24*x^11 + 60*x^10 - 72*x^8 - 128*x^7 + 24*x^6 + 240*x^5 + 396*x^4 + 344*x^3 + 204*x^2 + 80*x + 25)
 
gp: K = bnfinit(x^16 - 8*x^13 + 8*x^12 + 24*x^11 + 60*x^10 - 72*x^8 - 128*x^7 + 24*x^6 + 240*x^5 + 396*x^4 + 344*x^3 + 204*x^2 + 80*x + 25, 1)
 

Normalized defining polynomial

\( x^{16} - 8 x^{13} + 8 x^{12} + 24 x^{11} + 60 x^{10} - 72 x^{8} - 128 x^{7} + 24 x^{6} + 240 x^{5} + 396 x^{4} + 344 x^{3} + 204 x^{2} + 80 x + 25 \)

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:  \(149587343098087735296=2^{48}\cdot 3^{12}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $18.24$
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:  $2, 3$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $\frac{1}{13} a^{14} - \frac{6}{13} a^{13} + \frac{6}{13} a^{12} + \frac{6}{13} a^{11} - \frac{5}{13} a^{8} + \frac{4}{13} a^{7} + \frac{2}{13} a^{6} + \frac{3}{13} a^{4} + \frac{1}{13} a^{3} + \frac{1}{13} a^{2} - \frac{4}{13} a + \frac{3}{13}$, $\frac{1}{172095557075} a^{15} + \frac{18416476}{2647623955} a^{14} + \frac{549672153}{6883822283} a^{13} + \frac{44301432542}{172095557075} a^{12} + \frac{74513732563}{172095557075} a^{11} - \frac{688750887}{13238119775} a^{10} - \frac{7974601441}{34419111415} a^{9} + \frac{47242845}{529524791} a^{8} + \frac{648911756}{13238119775} a^{7} - \frac{20938361783}{172095557075} a^{6} - \frac{83826469321}{172095557075} a^{5} + \frac{3299125148}{6883822283} a^{4} + \frac{43899903496}{172095557075} a^{3} - \frac{63021002666}{172095557075} a^{2} - \frac{59865844436}{172095557075} a + \frac{9213432918}{34419111415}$

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

Class group and class number

$C_{2}$, which has order $2$

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
magma: [K!f(g): g in Generators(UK)];
 
sage: UK.fundamental_units()
 
gp: K.fu
 
Regulator:  \( 2775.22191388 \)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

$C_2^2:D_4$ (as 16T43):

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 32
The 14 conjugacy class representatives for $C_2^2:D_4$
Character table for $C_2^2:D_4$

Intermediate fields

\(\Q(\sqrt{3}) \), \(\Q(\sqrt{2}) \), \(\Q(\sqrt{6}) \), 4.2.9216.1, 4.2.1024.1, 4.0.27648.1 x2, 4.0.13824.1 x2, \(\Q(\sqrt{2}, \sqrt{3})\), 8.0.3057647616.7, 8.4.764411904.3, 8.4.339738624.2

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

Sibling fields

Galois closure: data not computed
Degree 16 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 ${\href{/LocalNumberField/5.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/7.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/11.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/13.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/17.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/19.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/23.2.0.1}{2} }^{4}{,}\,{\href{/LocalNumberField/23.1.0.1}{1} }^{8}$ ${\href{/LocalNumberField/29.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/31.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/37.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/41.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/43.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/47.2.0.1}{2} }^{4}{,}\,{\href{/LocalNumberField/47.1.0.1}{1} }^{8}$ ${\href{/LocalNumberField/53.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/59.4.0.1}{4} }^{4}$

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
3Data not computed