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Properties

Label 20.0.49413326192...0625.1
Degree $20$
Signature $[0, 10]$
Discriminant $3^{10}\cdot 5^{10}\cdot 199^{2}\cdot 1471^{2}$
Root discriminant $13.64$
Ramified primes $3, 5, 199, 1471$
Class number $1$ (GRH)
Class group Trivial (GRH)
Galois group 20T656

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![1, 1, 1, 4, 5, 9, 3, 4, 8, -6, 6, -15, 9, -10, 11, -8, 5, -5, 2, -1, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^20 - x^19 + 2*x^18 - 5*x^17 + 5*x^16 - 8*x^15 + 11*x^14 - 10*x^13 + 9*x^12 - 15*x^11 + 6*x^10 - 6*x^9 + 8*x^8 + 4*x^7 + 3*x^6 + 9*x^5 + 5*x^4 + 4*x^3 + x^2 + x + 1)
 
gp: K = bnfinit(x^20 - x^19 + 2*x^18 - 5*x^17 + 5*x^16 - 8*x^15 + 11*x^14 - 10*x^13 + 9*x^12 - 15*x^11 + 6*x^10 - 6*x^9 + 8*x^8 + 4*x^7 + 3*x^6 + 9*x^5 + 5*x^4 + 4*x^3 + x^2 + x + 1, 1)
 

Normalized defining polynomial

\( x^{20} - x^{19} + 2 x^{18} - 5 x^{17} + 5 x^{16} - 8 x^{15} + 11 x^{14} - 10 x^{13} + 9 x^{12} - 15 x^{11} + 6 x^{10} - 6 x^{9} + 8 x^{8} + 4 x^{7} + 3 x^{6} + 9 x^{5} + 5 x^{4} + 4 x^{3} + x^{2} + x + 1 \)

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

Invariants

Degree:  $20$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[0, 10]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(49413326192613369140625=3^{10}\cdot 5^{10}\cdot 199^{2}\cdot 1471^{2}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $13.64$
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:  $3, 5, 199, 1471$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $a^{14}$, $a^{15}$, $a^{16}$, $a^{17}$, $\frac{1}{155} a^{18} - \frac{34}{155} a^{17} - \frac{27}{155} a^{16} + \frac{6}{31} a^{15} + \frac{22}{155} a^{14} + \frac{76}{155} a^{13} - \frac{74}{155} a^{12} + \frac{51}{155} a^{11} - \frac{9}{31} a^{10} - \frac{36}{155} a^{9} - \frac{21}{155} a^{8} - \frac{37}{155} a^{7} - \frac{4}{31} a^{6} + \frac{6}{155} a^{5} + \frac{8}{31} a^{4} - \frac{2}{155} a^{3} + \frac{66}{155} a^{2} - \frac{27}{155} a - \frac{54}{155}$, $\frac{1}{1464595} a^{19} + \frac{4428}{1464595} a^{18} - \frac{5236}{26629} a^{17} + \frac{142126}{1464595} a^{16} - \frac{602}{1705} a^{15} - \frac{117341}{292919} a^{14} - \frac{202067}{1464595} a^{13} + \frac{42753}{133145} a^{12} - \frac{583288}{1464595} a^{11} + \frac{248054}{1464595} a^{10} - \frac{665488}{1464595} a^{9} - \frac{482789}{1464595} a^{8} + \frac{518126}{1464595} a^{7} - \frac{646614}{1464595} a^{6} + \frac{516457}{1464595} a^{5} + \frac{389898}{1464595} a^{4} - \frac{607933}{1464595} a^{3} - \frac{70904}{292919} a^{2} + \frac{7912}{47245} a - \frac{637128}{1464595}$

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:  $9$
magma: UnitRank(K);
 
sage: UK.rank()
 
gp: K.fu
 
Torsion generator:  \( \frac{5926}{47245} a^{19} - \frac{18443}{47245} a^{18} + \frac{2169}{4295} a^{17} - \frac{64082}{47245} a^{16} + \frac{123}{55} a^{15} - \frac{129872}{47245} a^{14} + \frac{221157}{47245} a^{13} - \frac{24093}{4295} a^{12} + \frac{266921}{47245} a^{11} - \frac{343641}{47245} a^{10} + \frac{368508}{47245} a^{9} - \frac{237823}{47245} a^{8} + \frac{321188}{47245} a^{7} - \frac{217819}{47245} a^{6} + \frac{49776}{47245} a^{5} - \frac{122912}{47245} a^{4} - \frac{56871}{47245} a^{3} - \frac{32656}{47245} a^{2} - \frac{76696}{47245} a + \frac{20341}{47245} \) (order $6$)
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:  \( 2740.01327388 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

20T656:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A non-solvable group of order 57600
The 70 conjugacy class representatives for t20n656 are not computed
Character table for t20n656 is not computed

Intermediate fields

\(\Q(\sqrt{-15}) \), \(\Q(\sqrt{-3}) \), \(\Q(\sqrt{5}) \), \(\Q(\sqrt{-3}, \sqrt{5})\), 10.2.914778125.1

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 24 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 ${\href{/LocalNumberField/2.10.0.1}{10} }^{2}$ R R ${\href{/LocalNumberField/7.8.0.1}{8} }^{2}{,}\,{\href{/LocalNumberField/7.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/11.10.0.1}{10} }{,}\,{\href{/LocalNumberField/11.6.0.1}{6} }{,}\,{\href{/LocalNumberField/11.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/13.8.0.1}{8} }^{2}{,}\,{\href{/LocalNumberField/13.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/17.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/17.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/19.5.0.1}{5} }^{2}{,}\,{\href{/LocalNumberField/19.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/19.1.0.1}{1} }^{2}$ ${\href{/LocalNumberField/23.10.0.1}{10} }^{2}$ ${\href{/LocalNumberField/29.10.0.1}{10} }{,}\,{\href{/LocalNumberField/29.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/29.2.0.1}{2} }$ ${\href{/LocalNumberField/31.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/31.2.0.1}{2} }^{4}{,}\,{\href{/LocalNumberField/31.1.0.1}{1} }^{4}$ ${\href{/LocalNumberField/37.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/37.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/41.10.0.1}{10} }{,}\,{\href{/LocalNumberField/41.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/41.2.0.1}{2} }$ ${\href{/LocalNumberField/43.8.0.1}{8} }^{2}{,}\,{\href{/LocalNumberField/43.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/47.6.0.1}{6} }^{2}{,}\,{\href{/LocalNumberField/47.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/53.10.0.1}{10} }^{2}$ ${\href{/LocalNumberField/59.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/59.2.0.1}{2} }^{6}$

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
3Data not computed
$5$5.4.2.1$x^{4} + 15 x^{2} + 100$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
5.4.2.1$x^{4} + 15 x^{2} + 100$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
5.12.6.1$x^{12} + 500 x^{6} - 3125 x^{2} + 62500$$2$$6$$6$$C_6\times C_2$$[\ ]_{2}^{6}$
$199$$\Q_{199}$$x + 2$$1$$1$$0$Trivial$[\ ]$
$\Q_{199}$$x + 2$$1$$1$$0$Trivial$[\ ]$
$\Q_{199}$$x + 2$$1$$1$$0$Trivial$[\ ]$
$\Q_{199}$$x + 2$$1$$1$$0$Trivial$[\ ]$
$\Q_{199}$$x + 2$$1$$1$$0$Trivial$[\ ]$
$\Q_{199}$$x + 2$$1$$1$$0$Trivial$[\ ]$
$\Q_{199}$$x + 2$$1$$1$$0$Trivial$[\ ]$
$\Q_{199}$$x + 2$$1$$1$$0$Trivial$[\ ]$
$\Q_{199}$$x + 2$$1$$1$$0$Trivial$[\ ]$
$\Q_{199}$$x + 2$$1$$1$$0$Trivial$[\ ]$
199.2.1.2$x^{2} + 398$$2$$1$$1$$C_2$$[\ ]_{2}$
199.2.1.2$x^{2} + 398$$2$$1$$1$$C_2$$[\ ]_{2}$
199.3.0.1$x^{3} - x + 4$$1$$3$$0$$C_3$$[\ ]^{3}$
199.3.0.1$x^{3} - x + 4$$1$$3$$0$$C_3$$[\ ]^{3}$
1471Data not computed