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Properties

Label 14.0.48859625810...4112.1
Degree $14$
Signature $[0, 7]$
Discriminant $-\,2^{21}\cdot 13^{12}$
Root discriminant $25.49$
Ramified primes $2, 13$
Class number $1$ (GRH)
Class group Trivial (GRH)
Galois group $D_{7}$ (as 14T2)

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![400, 880, 1756, 1264, 280, -1148, -877, 148, 470, 40, -72, -12, 10, -4, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^14 - 4*x^13 + 10*x^12 - 12*x^11 - 72*x^10 + 40*x^9 + 470*x^8 + 148*x^7 - 877*x^6 - 1148*x^5 + 280*x^4 + 1264*x^3 + 1756*x^2 + 880*x + 400)
 
gp: K = bnfinit(x^14 - 4*x^13 + 10*x^12 - 12*x^11 - 72*x^10 + 40*x^9 + 470*x^8 + 148*x^7 - 877*x^6 - 1148*x^5 + 280*x^4 + 1264*x^3 + 1756*x^2 + 880*x + 400, 1)
 

Normalized defining polynomial

\( x^{14} - 4 x^{13} + 10 x^{12} - 12 x^{11} - 72 x^{10} + 40 x^{9} + 470 x^{8} + 148 x^{7} - 877 x^{6} - 1148 x^{5} + 280 x^{4} + 1264 x^{3} + 1756 x^{2} + 880 x + 400 \)

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

Invariants

Degree:  $14$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[0, 7]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(-48859625810781274112=-\,2^{21}\cdot 13^{12}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $25.49$
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:  $2, 13$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is Galois over $\Q$.
This is not a CM field.

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

$1$, $a$, $a^{2}$, $a^{3}$, $\frac{1}{2} a^{4} - \frac{1}{2} a^{2}$, $\frac{1}{2} a^{5} - \frac{1}{2} a^{3}$, $\frac{1}{4} a^{6} - \frac{1}{4} a^{5} - \frac{1}{4} a^{4} + \frac{1}{4} a^{3} - \frac{1}{2} a^{2} - \frac{1}{2} a$, $\frac{1}{4} a^{7} + \frac{1}{4} a^{3} - \frac{1}{2} a$, $\frac{1}{40} a^{8} + \frac{1}{10} a^{6} - \frac{1}{20} a^{5} - \frac{3}{40} a^{4} - \frac{9}{20} a^{3} - \frac{9}{20} a^{2} + \frac{1}{10} a$, $\frac{1}{40} a^{9} + \frac{1}{10} a^{7} - \frac{1}{20} a^{6} - \frac{3}{40} a^{5} + \frac{1}{20} a^{4} - \frac{9}{20} a^{3} - \frac{2}{5} a^{2}$, $\frac{1}{80} a^{10} - \frac{1}{80} a^{8} + \frac{1}{10} a^{7} - \frac{3}{80} a^{6} - \frac{1}{10} a^{5} + \frac{17}{80} a^{4} - \frac{1}{5} a^{3} + \frac{1}{8} a^{2} - \frac{1}{2}$, $\frac{1}{1120} a^{11} - \frac{1}{560} a^{10} + \frac{9}{1120} a^{9} - \frac{1}{280} a^{8} - \frac{59}{1120} a^{7} - \frac{7}{80} a^{6} + \frac{211}{1120} a^{5} + \frac{29}{140} a^{4} - \frac{233}{560} a^{3} - \frac{51}{140} a^{2} - \frac{27}{140} a - \frac{2}{7}$, $\frac{1}{22400} a^{12} + \frac{3}{11200} a^{11} - \frac{19}{3200} a^{10} + \frac{9}{1120} a^{9} + \frac{1}{3200} a^{8} - \frac{45}{448} a^{7} + \frac{29}{22400} a^{6} + \frac{261}{2800} a^{5} - \frac{531}{5600} a^{4} + \frac{289}{700} a^{3} + \frac{2693}{5600} a^{2} + \frac{1}{280} a + \frac{23}{56}$, $\frac{1}{14940800} a^{13} - \frac{1}{64400} a^{12} - \frac{1121}{14940800} a^{11} + \frac{77}{46400} a^{10} + \frac{38407}{14940800} a^{9} - \frac{21439}{3735200} a^{8} + \frac{685409}{14940800} a^{7} + \frac{432713}{7470400} a^{6} + \frac{143723}{3735200} a^{5} + \frac{217}{10672} a^{4} + \frac{26137}{3735200} a^{3} + \frac{12927}{64400} a^{2} - \frac{8143}{186760} a + \frac{1903}{18676}$

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

Class group and class number

Trivial group, which has order $1$ (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:  $6$
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:  \( 783838.546948 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

$D_7$ (as 14T2):

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 14
The 5 conjugacy class representatives for $D_{7}$
Character table for $D_{7}$

Intermediate fields

\(\Q(\sqrt{-2}) \), 7.1.2471326208.1 x7

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

Sibling fields

Degree 7 sibling: 7.1.2471326208.1

Frobenius cycle types

$p$ 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59
Cycle type R ${\href{/LocalNumberField/3.7.0.1}{7} }^{2}$ ${\href{/LocalNumberField/5.2.0.1}{2} }^{7}$ ${\href{/LocalNumberField/7.2.0.1}{2} }^{7}$ ${\href{/LocalNumberField/11.7.0.1}{7} }^{2}$ R ${\href{/LocalNumberField/17.7.0.1}{7} }^{2}$ ${\href{/LocalNumberField/19.7.0.1}{7} }^{2}$ ${\href{/LocalNumberField/23.2.0.1}{2} }^{7}$ ${\href{/LocalNumberField/29.2.0.1}{2} }^{7}$ ${\href{/LocalNumberField/31.2.0.1}{2} }^{7}$ ${\href{/LocalNumberField/37.2.0.1}{2} }^{7}$ ${\href{/LocalNumberField/41.7.0.1}{7} }^{2}$ ${\href{/LocalNumberField/43.7.0.1}{7} }^{2}$ ${\href{/LocalNumberField/47.2.0.1}{2} }^{7}$ ${\href{/LocalNumberField/53.2.0.1}{2} }^{7}$ ${\href{/LocalNumberField/59.7.0.1}{7} }^{2}$

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$2.2.3.3$x^{2} + 2$$2$$1$$3$$C_2$$[3]$
2.2.3.3$x^{2} + 2$$2$$1$$3$$C_2$$[3]$
2.2.3.3$x^{2} + 2$$2$$1$$3$$C_2$$[3]$
2.2.3.3$x^{2} + 2$$2$$1$$3$$C_2$$[3]$
2.2.3.3$x^{2} + 2$$2$$1$$3$$C_2$$[3]$
2.2.3.3$x^{2} + 2$$2$$1$$3$$C_2$$[3]$
2.2.3.3$x^{2} + 2$$2$$1$$3$$C_2$$[3]$
13Data not computed