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Properties

Label 20.4.15418170861...000.11
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

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-131, -456, 4786, -9614, 12925, -15220, 12906, -11594, 7261, -4996, 1998, -1016, 68, 40, -142, 40, -21, -2, 4, -4, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^20 - 4*x^19 + 4*x^18 - 2*x^17 - 21*x^16 + 40*x^15 - 142*x^14 + 40*x^13 + 68*x^12 - 1016*x^11 + 1998*x^10 - 4996*x^9 + 7261*x^8 - 11594*x^7 + 12906*x^6 - 15220*x^5 + 12925*x^4 - 9614*x^3 + 4786*x^2 - 456*x - 131)
 
gp: K = bnfinit(x^20 - 4*x^19 + 4*x^18 - 2*x^17 - 21*x^16 + 40*x^15 - 142*x^14 + 40*x^13 + 68*x^12 - 1016*x^11 + 1998*x^10 - 4996*x^9 + 7261*x^8 - 11594*x^7 + 12906*x^6 - 15220*x^5 + 12925*x^4 - 9614*x^3 + 4786*x^2 - 456*x - 131, 1)
 

Normalized defining polynomial

\( x^{20} - 4 x^{19} + 4 x^{18} - 2 x^{17} - 21 x^{16} + 40 x^{15} - 142 x^{14} + 40 x^{13} + 68 x^{12} - 1016 x^{11} + 1998 x^{10} - 4996 x^{9} + 7261 x^{8} - 11594 x^{7} + 12906 x^{6} - 15220 x^{5} + 12925 x^{4} - 9614 x^{3} + 4786 x^{2} - 456 x - 131 \)

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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $a^{14}$, $a^{15}$, $a^{16}$, $a^{17}$, $a^{18}$, $\frac{1}{436351308853343164114726115457085039} a^{19} + \frac{136363674272458261818654460027066878}{436351308853343164114726115457085039} a^{18} - \frac{20598971441245220083558573590492458}{436351308853343164114726115457085039} a^{17} - \frac{126585553340078696332529270484011302}{436351308853343164114726115457085039} a^{16} + \frac{106076788839520589101993107106863825}{436351308853343164114726115457085039} a^{15} - \frac{98023154547771369392969174186670307}{436351308853343164114726115457085039} a^{14} - \frac{68176563703046097696438572289304480}{436351308853343164114726115457085039} a^{13} + \frac{12493081655801409919992425518679120}{436351308853343164114726115457085039} a^{12} - \frac{68988518653301869021505803006272536}{436351308853343164114726115457085039} a^{11} - \frac{213404882910587075425272858790927356}{436351308853343164114726115457085039} a^{10} - \frac{162073572661162641764297603998387100}{436351308853343164114726115457085039} a^{9} - \frac{144557347882365065010741959545243673}{436351308853343164114726115457085039} a^{8} + \frac{116930279751018213167099709125001473}{436351308853343164114726115457085039} a^{7} + \frac{155237824306129466781425052630478967}{436351308853343164114726115457085039} a^{6} - \frac{88337278288516990181825546600268197}{436351308853343164114726115457085039} a^{5} - \frac{80919789248582359894515249550854713}{436351308853343164114726115457085039} a^{4} - \frac{127567194602034165535098402902563036}{436351308853343164114726115457085039} a^{3} + \frac{55753963300113465923124208828133869}{436351308853343164114726115457085039} a^{2} + \frac{16898146111250802660421648113841270}{436351308853343164114726115457085039} a + \frac{188368844782826640812459254134251840}{436351308853343164114726115457085039}$

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:  \( 4367280.43286 \) (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}$