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Properties

Label 16.0.18425247191...0000.2
Degree $16$
Signature $[0, 8]$
Discriminant $2^{20}\cdot 5^{12}\cdot 11^{2}\cdot 29^{6}$
Root discriminant $37.94$
Ramified primes $2, 5, 11, 29$
Class number $4$ (GRH)
Class group $[2, 2]$ (GRH)
Galois group 16T781

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![1628176, 0, -1737912, 0, 1032100, 0, -364002, 0, 77159, 0, -10098, 0, 850, 0, -43, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^16 - 43*x^14 + 850*x^12 - 10098*x^10 + 77159*x^8 - 364002*x^6 + 1032100*x^4 - 1737912*x^2 + 1628176)
 
gp: K = bnfinit(x^16 - 43*x^14 + 850*x^12 - 10098*x^10 + 77159*x^8 - 364002*x^6 + 1032100*x^4 - 1737912*x^2 + 1628176, 1)
 

Normalized defining polynomial

\( x^{16} - 43 x^{14} + 850 x^{12} - 10098 x^{10} + 77159 x^{8} - 364002 x^{6} + 1032100 x^{4} - 1737912 x^{2} + 1628176 \)

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:  \(18425247191296000000000000=2^{20}\cdot 5^{12}\cdot 11^{2}\cdot 29^{6}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $37.94$
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:  $2, 5, 11, 29$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $\frac{1}{58} a^{10} + \frac{1}{58} a^{8} + \frac{2}{29} a^{6} - \frac{12}{29} a^{4} - \frac{15}{58} a^{2}$, $\frac{1}{58} a^{11} + \frac{1}{58} a^{9} + \frac{2}{29} a^{7} - \frac{12}{29} a^{5} - \frac{15}{58} a^{3}$, $\frac{1}{2204} a^{12} - \frac{5}{2204} a^{10} + \frac{159}{551} a^{8} + \frac{179}{1102} a^{6} - \frac{45}{2204} a^{4} + \frac{37}{551} a^{2} - \frac{1}{19}$, $\frac{1}{2204} a^{13} - \frac{5}{2204} a^{11} + \frac{159}{551} a^{9} + \frac{179}{1102} a^{7} - \frac{45}{2204} a^{5} + \frac{37}{551} a^{3} - \frac{1}{19} a$, $\frac{1}{39556620686004488} a^{14} - \frac{4948765199}{2081927404526552} a^{12} + \frac{37949308500135}{4944577585750561} a^{10} + \frac{340763503849935}{1798028213000204} a^{8} + \frac{10222475883822427}{39556620686004488} a^{6} + \frac{1790344433437234}{4944577585750561} a^{4} - \frac{1191315446445521}{4944577585750561} a^{2} - \frac{3382135585376}{15500243215519}$, $\frac{1}{39556620686004488} a^{15} - \frac{4948765199}{2081927404526552} a^{13} + \frac{37949308500135}{4944577585750561} a^{11} + \frac{340763503849935}{1798028213000204} a^{9} + \frac{10222475883822427}{39556620686004488} a^{7} + \frac{1790344433437234}{4944577585750561} a^{5} - \frac{1191315446445521}{4944577585750561} a^{3} - \frac{3382135585376}{15500243215519} a$

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

Class group and class number

$C_{2}\times C_{2}$, which has order $4$ (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:  \( -\frac{16885070391}{2081927404526552} a^{14} + \frac{661649773761}{2081927404526552} a^{12} - \frac{5879492221221}{1040963702263276} a^{10} + \frac{5580485584989}{94633063842116} a^{8} - \frac{779686909272985}{2081927404526552} a^{6} + \frac{1294970122679113}{1040963702263276} a^{4} - \frac{977966738623959}{520481851131638} a^{2} + \frac{1368930036571}{815802274501} \) (order $10$)
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:  \( 1050248.72826 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

16T781:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 512
The 62 conjugacy class representatives for t16n781 are not computed
Character table for t16n781 is not computed

Intermediate fields

\(\Q(\sqrt{5}) \), \(\Q(\zeta_{5})\), 4.4.725.1, 4.0.3625.1, 8.0.13140625.1

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 ${\href{/LocalNumberField/3.8.0.1}{8} }^{2}$ R ${\href{/LocalNumberField/7.4.0.1}{4} }^{4}$ R ${\href{/LocalNumberField/13.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/17.8.0.1}{8} }^{2}$ ${\href{/LocalNumberField/19.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/19.2.0.1}{2} }^{4}$ ${\href{/LocalNumberField/23.4.0.1}{4} }^{4}$ R ${\href{/LocalNumberField/31.2.0.1}{2} }^{6}{,}\,{\href{/LocalNumberField/31.1.0.1}{1} }^{4}$ ${\href{/LocalNumberField/37.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/41.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/41.2.0.1}{2} }^{2}{,}\,{\href{/LocalNumberField/41.1.0.1}{1} }^{4}$ ${\href{/LocalNumberField/43.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/47.8.0.1}{8} }^{2}$ ${\href{/LocalNumberField/53.4.0.1}{4} }^{4}$ ${\href{/LocalNumberField/59.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/59.2.0.1}{2} }^{4}$

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
$2$2.8.12.12$x^{8} + 2 x^{6} + 48$$2$$4$$12$$((C_8 : C_2):C_2):C_2$$[2, 2, 2, 3]^{4}$
2.8.8.9$x^{8} + 6 x^{6} + 4 x^{5} + 16$$2$$4$$8$$((C_8 : C_2):C_2):C_2$$[2, 2, 2, 2]^{4}$
$5$5.8.6.1$x^{8} - 5 x^{4} + 400$$4$$2$$6$$C_4\times C_2$$[\ ]_{4}^{2}$
5.8.6.1$x^{8} - 5 x^{4} + 400$$4$$2$$6$$C_4\times C_2$$[\ ]_{4}^{2}$
$11$11.2.1.1$x^{2} - 11$$2$$1$$1$$C_2$$[\ ]_{2}$
11.2.1.1$x^{2} - 11$$2$$1$$1$$C_2$$[\ ]_{2}$
11.2.0.1$x^{2} - x + 7$$1$$2$$0$$C_2$$[\ ]^{2}$
11.2.0.1$x^{2} - x + 7$$1$$2$$0$$C_2$$[\ ]^{2}$
11.2.0.1$x^{2} - x + 7$$1$$2$$0$$C_2$$[\ ]^{2}$
11.2.0.1$x^{2} - x + 7$$1$$2$$0$$C_2$$[\ ]^{2}$
11.2.0.1$x^{2} - x + 7$$1$$2$$0$$C_2$$[\ ]^{2}$
11.2.0.1$x^{2} - x + 7$$1$$2$$0$$C_2$$[\ ]^{2}$
$29$29.4.2.2$x^{4} - 29 x^{2} + 2523$$2$$2$$2$$C_4$$[\ ]_{2}^{2}$
29.4.0.1$x^{4} - x + 19$$1$$4$$0$$C_4$$[\ ]^{4}$
29.4.2.1$x^{4} + 145 x^{2} + 7569$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
29.4.2.1$x^{4} + 145 x^{2} + 7569$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$