Properties

Label 16.0.63456228123...0000.9
Degree $16$
Signature $[0, 8]$
Discriminant $2^{32}\cdot 3^{8}\cdot 5^{8}\cdot 7^{8}$
Root discriminant $40.99$
Ramified primes $2, 3, 5, 7$
Class number $64$ (GRH)
Class group $[2, 2, 2, 8]$ (GRH)
Galois group $C_2^4$ (as 16T3)

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magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![7225, 0, -16020, 0, 11246, 0, -1272, 0, -1101, 0, 24, 0, 134, 0, -12, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^16 - 12*x^14 + 134*x^12 + 24*x^10 - 1101*x^8 - 1272*x^6 + 11246*x^4 - 16020*x^2 + 7225)
 
gp: K = bnfinit(x^16 - 12*x^14 + 134*x^12 + 24*x^10 - 1101*x^8 - 1272*x^6 + 11246*x^4 - 16020*x^2 + 7225, 1)
 

Normalized defining polynomial

\( x^{16} - 12 x^{14} + 134 x^{12} + 24 x^{10} - 1101 x^{8} - 1272 x^{6} + 11246 x^{4} - 16020 x^{2} + 7225 \)

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:  \(63456228123711897600000000=2^{32}\cdot 3^{8}\cdot 5^{8}\cdot 7^{8}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $40.99$
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:  $2, 3, 5, 7$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is Galois and abelian over $\Q$.
Conductor:  \(840=2^{3}\cdot 3\cdot 5\cdot 7\)
Dirichlet character group:    $\lbrace$$\chi_{840}(1,·)$, $\chi_{840}(491,·)$, $\chi_{840}(769,·)$, $\chi_{840}(589,·)$, $\chi_{840}(239,·)$, $\chi_{840}(671,·)$, $\chi_{840}(419,·)$, $\chi_{840}(41,·)$, $\chi_{840}(811,·)$, $\chi_{840}(559,·)$, $\chi_{840}(449,·)$, $\chi_{840}(629,·)$, $\chi_{840}(631,·)$, $\chi_{840}(379,·)$, $\chi_{840}(701,·)$, $\chi_{840}(181,·)$$\rbrace$
This is a CM field.

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $\frac{1}{12} a^{8} - \frac{5}{12} a^{4} + \frac{1}{12}$, $\frac{1}{12} a^{9} - \frac{5}{12} a^{5} + \frac{1}{12} a$, $\frac{1}{60} a^{10} - \frac{17}{60} a^{6} + \frac{1}{60} a^{2}$, $\frac{1}{60} a^{11} - \frac{17}{60} a^{7} + \frac{1}{60} a^{3}$, $\frac{1}{1260} a^{12} + \frac{1}{210} a^{10} - \frac{1}{30} a^{8} + \frac{3}{10} a^{6} + \frac{17}{70} a^{4} + \frac{41}{210} a^{2} + \frac{55}{252}$, $\frac{1}{21420} a^{13} + \frac{1}{140} a^{11} + \frac{2}{255} a^{9} - \frac{13}{60} a^{7} - \frac{62}{1785} a^{5} - \frac{17}{420} a^{3} + \frac{97}{4284} a$, $\frac{1}{142421580} a^{14} - \frac{401}{2792580} a^{12} + \frac{13222}{2373693} a^{10} + \frac{9581}{398940} a^{8} + \frac{8506}{11868465} a^{6} + \frac{160207}{398940} a^{4} - \frac{68432743}{142421580} a^{2} - \frac{98575}{279258}$, $\frac{1}{712107900} a^{15} - \frac{6901}{356053950} a^{13} - \frac{15641}{19780775} a^{11} + \frac{390617}{16954950} a^{9} + \frac{266579}{19780775} a^{7} - \frac{1182547}{118684650} a^{5} + \frac{65850461}{712107900} a^{3} + \frac{12483157}{35605395} a$

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

Class group and class number

$C_{2}\times C_{2}\times C_{2}\times C_{8}$, which has order $64$ (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:  \( \frac{4}{3815} a^{14} - \frac{863}{68670} a^{12} + \frac{451}{3270} a^{10} + \frac{161}{3270} a^{8} - \frac{32311}{22890} a^{6} - \frac{49151}{22890} a^{4} + \frac{18843}{1526} a^{2} - \frac{9823}{981} \) (order $4$)
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:  \( 472078.871668 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

$C_2^4$ (as 16T3):

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
An abelian group of order 16
The 16 conjugacy class representatives for $C_2^4$
Character table for $C_2^4$

Intermediate fields

\(\Q(\sqrt{-1}) \), \(\Q(\sqrt{35}) \), \(\Q(\sqrt{-35}) \), \(\Q(\sqrt{210}) \), \(\Q(\sqrt{-210}) \), \(\Q(\sqrt{6}) \), \(\Q(\sqrt{-6}) \), \(\Q(\sqrt{-10}) \), \(\Q(\sqrt{10}) \), \(\Q(\sqrt{-14}) \), \(\Q(\sqrt{14}) \), \(\Q(\sqrt{-21}) \), \(\Q(\sqrt{21}) \), \(\Q(\sqrt{-15}) \), \(\Q(\sqrt{15}) \), \(\Q(i, \sqrt{35})\), \(\Q(i, \sqrt{210})\), \(\Q(i, \sqrt{6})\), \(\Q(\sqrt{6}, \sqrt{35})\), \(\Q(\sqrt{-6}, \sqrt{35})\), \(\Q(\sqrt{-6}, \sqrt{-35})\), \(\Q(\sqrt{6}, \sqrt{-35})\), \(\Q(i, \sqrt{10})\), \(\Q(i, \sqrt{14})\), \(\Q(i, \sqrt{21})\), \(\Q(i, \sqrt{15})\), \(\Q(\sqrt{-10}, \sqrt{-14})\), \(\Q(\sqrt{10}, \sqrt{14})\), \(\Q(\sqrt{-15}, \sqrt{-21})\), \(\Q(\sqrt{15}, \sqrt{21})\), \(\Q(\sqrt{-10}, \sqrt{14})\), \(\Q(\sqrt{10}, \sqrt{-14})\), \(\Q(\sqrt{15}, \sqrt{-21})\), \(\Q(\sqrt{-15}, \sqrt{21})\), \(\Q(\sqrt{-10}, \sqrt{-21})\), \(\Q(\sqrt{10}, \sqrt{21})\), \(\Q(\sqrt{-14}, \sqrt{-15})\), \(\Q(\sqrt{14}, \sqrt{15})\), \(\Q(\sqrt{-10}, \sqrt{21})\), \(\Q(\sqrt{10}, \sqrt{-21})\), \(\Q(\sqrt{-14}, \sqrt{15})\), \(\Q(\sqrt{14}, \sqrt{-15})\), \(\Q(\sqrt{6}, \sqrt{-10})\), \(\Q(\sqrt{6}, \sqrt{10})\), \(\Q(\sqrt{6}, \sqrt{-14})\), \(\Q(\sqrt{6}, \sqrt{14})\), \(\Q(\sqrt{-6}, \sqrt{-10})\), \(\Q(\sqrt{-6}, \sqrt{10})\), \(\Q(\sqrt{-6}, \sqrt{-14})\), \(\Q(\sqrt{-6}, \sqrt{14})\), 8.0.7965941760000.54, 8.0.98344960000.2, 8.0.31116960000.4, 8.0.7965941760000.39, 8.0.7965941760000.41, 8.0.3317760000.5, 8.0.12745506816.1, 8.0.7965941760000.15, 8.8.7965941760000.3, 8.0.7965941760000.46, 8.0.7965941760000.37, 8.0.7965941760000.51, 8.0.497871360000.5, 8.0.497871360000.4, 8.0.7965941760000.52

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

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 R R ${\href{/LocalNumberField/11.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/13.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/17.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/19.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/23.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/29.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/31.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/37.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/41.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/43.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/47.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/53.2.0.1}{2} }^{8}$ ${\href{/LocalNumberField/59.2.0.1}{2} }^{8}$

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$2.8.16.6$x^{8} + 4 x^{6} + 8 x^{2} + 4$$4$$2$$16$$C_2^3$$[2, 3]^{2}$
2.8.16.6$x^{8} + 4 x^{6} + 8 x^{2} + 4$$4$$2$$16$$C_2^3$$[2, 3]^{2}$
$3$3.4.2.1$x^{4} + 9 x^{2} + 36$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
3.4.2.1$x^{4} + 9 x^{2} + 36$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
3.4.2.1$x^{4} + 9 x^{2} + 36$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
3.4.2.1$x^{4} + 9 x^{2} + 36$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
$5$5.2.1.2$x^{2} + 10$$2$$1$$1$$C_2$$[\ ]_{2}$
5.2.1.2$x^{2} + 10$$2$$1$$1$$C_2$$[\ ]_{2}$
5.2.1.2$x^{2} + 10$$2$$1$$1$$C_2$$[\ ]_{2}$
5.2.1.2$x^{2} + 10$$2$$1$$1$$C_2$$[\ ]_{2}$
5.2.1.2$x^{2} + 10$$2$$1$$1$$C_2$$[\ ]_{2}$
5.2.1.2$x^{2} + 10$$2$$1$$1$$C_2$$[\ ]_{2}$
5.2.1.2$x^{2} + 10$$2$$1$$1$$C_2$$[\ ]_{2}$
5.2.1.2$x^{2} + 10$$2$$1$$1$$C_2$$[\ ]_{2}$
$7$7.4.2.1$x^{4} + 35 x^{2} + 441$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
7.4.2.1$x^{4} + 35 x^{2} + 441$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
7.4.2.1$x^{4} + 35 x^{2} + 441$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
7.4.2.1$x^{4} + 35 x^{2} + 441$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$