↑

Properties

Label 20.4.15418170861...0000.8
Degree $20$
Signature $[4, 8]$
Discriminant $2^{30}\cdot 5^{5}\cdot 11^{16}$
Root discriminant $28.80$
Ramified primes $2, 5, 11$
Class number $1$ (GRH)
Class group Trivial (GRH)
Galois group 20T427

Related objects

Downloads

Learn more about

Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-571, 1936, 994, -1388, -770, 834, -2256, -602, 566, -2834, -2974, 862, 743, -46, 154, -156, -66, 58, 0, -6, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^20 - 6*x^19 + 58*x^17 - 66*x^16 - 156*x^15 + 154*x^14 - 46*x^13 + 743*x^12 + 862*x^11 - 2974*x^10 - 2834*x^9 + 566*x^8 - 602*x^7 - 2256*x^6 + 834*x^5 - 770*x^4 - 1388*x^3 + 994*x^2 + 1936*x - 571)
 
gp: K = bnfinit(x^20 - 6*x^19 + 58*x^17 - 66*x^16 - 156*x^15 + 154*x^14 - 46*x^13 + 743*x^12 + 862*x^11 - 2974*x^10 - 2834*x^9 + 566*x^8 - 602*x^7 - 2256*x^6 + 834*x^5 - 770*x^4 - 1388*x^3 + 994*x^2 + 1936*x - 571, 1)
 

Normalized defining polynomial

\( x^{20} - 6 x^{19} + 58 x^{17} - 66 x^{16} - 156 x^{15} + 154 x^{14} - 46 x^{13} + 743 x^{12} + 862 x^{11} - 2974 x^{10} - 2834 x^{9} + 566 x^{8} - 602 x^{7} - 2256 x^{6} + 834 x^{5} - 770 x^{4} - 1388 x^{3} + 994 x^{2} + 1936 x - 571 \)

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

Invariants

Degree:  $20$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[4, 8]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(154181708612560135336755200000=2^{30}\cdot 5^{5}\cdot 11^{16}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $28.80$
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:  $2, 5, 11$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $a^{14}$, $a^{15}$, $a^{16}$, $a^{17}$, $a^{18}$, $\frac{1}{9438012273174048973055675436160015990871} a^{19} + \frac{1863394204336277073609672124593381241371}{9438012273174048973055675436160015990871} a^{18} + \frac{2995688326504691741033467541597590717427}{9438012273174048973055675436160015990871} a^{17} + \frac{1321613582705797939614335402733647875577}{9438012273174048973055675436160015990871} a^{16} - \frac{4675102037727593684899416980402749041101}{9438012273174048973055675436160015990871} a^{15} + \frac{3186620106665901756591731519267640801876}{9438012273174048973055675436160015990871} a^{14} + \frac{3465396321536539710266567678048660380}{20384475751995786118910746082419041017} a^{13} + \frac{2268033656712286260311634468519915651036}{9438012273174048973055675436160015990871} a^{12} - \frac{1785332913195662802858060828600316902022}{9438012273174048973055675436160015990871} a^{11} + \frac{754108256348844383266589350883425374307}{9438012273174048973055675436160015990871} a^{10} - \frac{1552046839259521958861817760742375524139}{9438012273174048973055675436160015990871} a^{9} + \frac{3840168709062664743945083653795555688070}{9438012273174048973055675436160015990871} a^{8} - \frac{3300668179797285859692649193157604900321}{9438012273174048973055675436160015990871} a^{7} + \frac{3230202423803717601802121979117169029146}{9438012273174048973055675436160015990871} a^{6} + \frac{2882032302452591476218282166806639185984}{9438012273174048973055675436160015990871} a^{5} - \frac{4717136969275192407501178021480819780765}{9438012273174048973055675436160015990871} a^{4} - \frac{1162646048921893019010172826309108468698}{9438012273174048973055675436160015990871} a^{3} + \frac{4174734292090681811458365388044065018018}{9438012273174048973055675436160015990871} a^{2} - \frac{1569462605679542744400063809137645843041}{9438012273174048973055675436160015990871} a + \frac{492779608280226631843124908739562097563}{9438012273174048973055675436160015990871}$

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:  $11$
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:  \( 3796482.3679 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

20T427:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 10240
The 136 conjugacy class representatives for t20n427 are not computed
Character table for t20n427 is not computed

Intermediate fields

\(\Q(\zeta_{11})^+\), 10.4.219503494144.2

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 $20$ R $20$ R ${\href{/LocalNumberField/13.10.0.1}{10} }{,}\,{\href{/LocalNumberField/13.5.0.1}{5} }^{2}$ ${\href{/LocalNumberField/17.10.0.1}{10} }{,}\,{\href{/LocalNumberField/17.5.0.1}{5} }^{2}$ ${\href{/LocalNumberField/19.10.0.1}{10} }^{2}$ ${\href{/LocalNumberField/23.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/23.2.0.1}{2} }^{2}{,}\,{\href{/LocalNumberField/23.1.0.1}{1} }^{4}$ ${\href{/LocalNumberField/29.5.0.1}{5} }^{4}$ ${\href{/LocalNumberField/31.10.0.1}{10} }^{2}$ ${\href{/LocalNumberField/37.10.0.1}{10} }{,}\,{\href{/LocalNumberField/37.5.0.1}{5} }^{2}$ ${\href{/LocalNumberField/41.10.0.1}{10} }^{2}$ ${\href{/LocalNumberField/43.4.0.1}{4} }{,}\,{\href{/LocalNumberField/43.2.0.1}{2} }^{4}{,}\,{\href{/LocalNumberField/43.1.0.1}{1} }^{8}$ $20$ ${\href{/LocalNumberField/53.10.0.1}{10} }{,}\,{\href{/LocalNumberField/53.5.0.1}{5} }^{2}$ ${\href{/LocalNumberField/59.10.0.1}{10} }^{2}$

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
2Data not computed
$5$5.10.5.2$x^{10} - 625 x^{2} + 6250$$2$$5$$5$$C_{10}$$[\ ]_{2}^{5}$
5.10.0.1$x^{10} + x^{2} - x + 3$$1$$10$$0$$C_{10}$$[\ ]^{10}$
$11$11.10.8.5$x^{10} - 2321 x^{5} + 2033647$$5$$2$$8$$C_{10}$$[\ ]_{5}^{2}$
11.10.8.5$x^{10} - 2321 x^{5} + 2033647$$5$$2$$8$$C_{10}$$[\ ]_{5}^{2}$