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Properties

Label 20.10.2325320963...0000.1
Degree $20$
Signature $[10, 5]$
Discriminant $-\,2^{12}\cdot 5^{22}\cdot 47^{8}$
Root discriminant $41.53$
Ramified primes $2, 5, 47$
Class number $1$ (GRH)
Class group Trivial (GRH)
Galois group 20T513

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-15376, 0, -10380, 0, 39695, 0, 1480, 0, -21355, 0, 4914, 0, 1910, 0, -490, 0, -60, 0, 10, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^20 + 10*x^18 - 60*x^16 - 490*x^14 + 1910*x^12 + 4914*x^10 - 21355*x^8 + 1480*x^6 + 39695*x^4 - 10380*x^2 - 15376)
 
gp: K = bnfinit(x^20 + 10*x^18 - 60*x^16 - 490*x^14 + 1910*x^12 + 4914*x^10 - 21355*x^8 + 1480*x^6 + 39695*x^4 - 10380*x^2 - 15376, 1)
 

Normalized defining polynomial

\( x^{20} + 10 x^{18} - 60 x^{16} - 490 x^{14} + 1910 x^{12} + 4914 x^{10} - 21355 x^{8} + 1480 x^{6} + 39695 x^{4} - 10380 x^{2} - 15376 \)

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

Invariants

Degree:  $20$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[10, 5]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(-232532096306259765625000000000000=-\,2^{12}\cdot 5^{22}\cdot 47^{8}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $41.53$
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:  $2, 5, 47$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $\frac{1}{2} a^{9} - \frac{1}{2} a^{3} - \frac{1}{2} a$, $\frac{1}{10} a^{10} - \frac{1}{2} a^{4} - \frac{1}{2} a^{2} + \frac{1}{5}$, $\frac{1}{10} a^{11} - \frac{1}{2} a^{5} - \frac{1}{2} a^{3} + \frac{1}{5} a$, $\frac{1}{10} a^{12} - \frac{1}{2} a^{6} - \frac{1}{2} a^{4} + \frac{1}{5} a^{2}$, $\frac{1}{10} a^{13} - \frac{1}{2} a^{7} - \frac{1}{2} a^{5} + \frac{1}{5} a^{3}$, $\frac{1}{20} a^{14} - \frac{1}{20} a^{11} - \frac{1}{20} a^{10} + \frac{1}{4} a^{8} - \frac{1}{2} a^{7} - \frac{1}{4} a^{6} + \frac{1}{4} a^{5} - \frac{3}{20} a^{4} - \frac{1}{4} a^{3} - \frac{1}{4} a^{2} - \frac{1}{10} a + \frac{2}{5}$, $\frac{1}{20} a^{15} - \frac{1}{20} a^{12} - \frac{1}{20} a^{11} - \frac{1}{4} a^{9} - \frac{1}{2} a^{8} - \frac{1}{4} a^{7} + \frac{1}{4} a^{6} - \frac{3}{20} a^{5} - \frac{1}{4} a^{4} + \frac{1}{4} a^{3} - \frac{1}{10} a^{2} - \frac{1}{10} a$, $\frac{1}{20} a^{16} - \frac{1}{20} a^{13} - \frac{1}{20} a^{12} - \frac{1}{20} a^{10} - \frac{1}{4} a^{8} + \frac{1}{4} a^{7} - \frac{3}{20} a^{6} - \frac{1}{4} a^{5} + \frac{1}{4} a^{4} + \frac{2}{5} a^{3} - \frac{1}{10} a^{2} - \frac{1}{2} a + \frac{2}{5}$, $\frac{1}{20} a^{17} - \frac{1}{20} a^{13} - \frac{1}{20} a^{10} - \frac{1}{4} a^{9} - \frac{1}{2} a^{8} + \frac{7}{20} a^{7} - \frac{1}{2} a^{6} + \frac{1}{4} a^{4} + \frac{3}{20} a^{3} + \frac{1}{4} a^{2} - \frac{1}{2} a + \frac{2}{5}$, $\frac{1}{7299578289972100} a^{18} - \frac{11758617607091}{3649789144986050} a^{16} - \frac{88313004429313}{3649789144986050} a^{14} + \frac{37204497437971}{3649789144986050} a^{12} + \frac{99708954156373}{3649789144986050} a^{10} + \frac{254404590882403}{1824894572493025} a^{8} - \frac{1186417362985409}{7299578289972100} a^{6} + \frac{761006539408747}{1824894572493025} a^{4} - \frac{811419222587121}{7299578289972100} a^{2} + \frac{405492610859588}{1824894572493025}$, $\frac{1}{452573853978270200} a^{19} + \frac{635773445970786}{56571731747283775} a^{17} - \frac{88313004429313}{226286926989135100} a^{15} - \frac{1359369805010276}{56571731747283775} a^{13} - \frac{1}{20} a^{12} - \frac{497613894669721}{113143463494567550} a^{11} - \frac{1}{20} a^{10} + \frac{42481384349104381}{226286926989135100} a^{9} - \frac{74912158091703619}{452573853978270200} a^{7} - \frac{1}{4} a^{6} + \frac{14296275086268669}{226286926989135100} a^{5} - \frac{95705936992224421}{452573853978270200} a^{3} + \frac{3}{20} a^{2} - \frac{15288600712580427}{113143463494567550} a + \frac{2}{5}$

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:  $14$
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:  \( 755907991.546 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

20T513:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 20480
The 128 conjugacy class representatives for t20n513 are not computed
Character table for t20n513 is not computed

Intermediate fields

\(\Q(\sqrt{5}) \), 5.5.6903125.1, 10.10.238265673828125.1

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

Sibling fields

Degree 20 siblings: data not computed
Degree 40 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 ${\href{/LocalNumberField/3.8.0.1}{8} }^{2}{,}\,{\href{/LocalNumberField/3.4.0.1}{4} }$ R ${\href{/LocalNumberField/7.8.0.1}{8} }{,}\,{\href{/LocalNumberField/7.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/7.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/11.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/11.2.0.1}{2} }^{4}$ ${\href{/LocalNumberField/13.8.0.1}{8} }{,}\,{\href{/LocalNumberField/13.4.0.1}{4} }^{3}$ ${\href{/LocalNumberField/17.8.0.1}{8} }^{2}{,}\,{\href{/LocalNumberField/17.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/19.10.0.1}{10} }{,}\,{\href{/LocalNumberField/19.5.0.1}{5} }^{2}$ ${\href{/LocalNumberField/23.4.0.1}{4} }^{5}$ ${\href{/LocalNumberField/29.5.0.1}{5} }^{4}$ ${\href{/LocalNumberField/31.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/31.2.0.1}{2} }^{2}{,}\,{\href{/LocalNumberField/31.1.0.1}{1} }^{4}$ ${\href{/LocalNumberField/37.8.0.1}{8} }^{2}{,}\,{\href{/LocalNumberField/37.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/41.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/41.2.0.1}{2} }^{3}{,}\,{\href{/LocalNumberField/41.1.0.1}{1} }^{2}$ ${\href{/LocalNumberField/43.8.0.1}{8} }{,}\,{\href{/LocalNumberField/43.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/43.2.0.1}{2} }^{2}$ R ${\href{/LocalNumberField/53.8.0.1}{8} }{,}\,{\href{/LocalNumberField/53.4.0.1}{4} }^{3}$ ${\href{/LocalNumberField/59.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/59.2.0.1}{2} }^{4}$

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$2.4.4.1$x^{4} + 8 x^{2} + 4$$2$$2$$4$$C_2^2$$[2]^{2}$
2.4.0.1$x^{4} - x + 1$$1$$4$$0$$C_4$$[\ ]^{4}$
2.4.0.1$x^{4} - x + 1$$1$$4$$0$$C_4$$[\ ]^{4}$
2.8.8.7$x^{8} + 2 x^{6} + 4 x^{5} + 16$$2$$4$$8$$((C_8 : C_2):C_2):C_2$$[2, 2, 2, 2]^{4}$
5Data not computed
$47$47.4.0.1$x^{4} - x + 39$$1$$4$$0$$C_4$$[\ ]^{4}$
47.4.2.2$x^{4} - 47 x^{2} + 28717$$2$$2$$2$$C_4$$[\ ]_{2}^{2}$
47.4.2.2$x^{4} - 47 x^{2} + 28717$$2$$2$$2$$C_4$$[\ ]_{2}^{2}$
47.4.2.2$x^{4} - 47 x^{2} + 28717$$2$$2$$2$$C_4$$[\ ]_{2}^{2}$
47.4.2.2$x^{4} - 47 x^{2} + 28717$$2$$2$$2$$C_4$$[\ ]_{2}^{2}$