↑

Properties

Label 21.3.99672685272...0583.1
Degree $21$
Signature $[3, 9]$
Discriminant $-\,3^{18}\cdot 7^{29}\cdot 19^{14}$
Root discriminant $268.23$
Ramified primes $3, 7, 19$
Class number $21$ (GRH)
Class group $[21]$ (GRH)
Galois group $C_3\times F_7$ (as 21T9)

Related objects

Downloads

Learn more about

Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![10460353203, 0, 0, 0, 0, 0, 0, 508304187, 0, 0, 0, 0, 0, 0, -103983, 0, 0, 0, 0, 0, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^21 - 103983*x^14 + 508304187*x^7 + 10460353203)
 
gp: K = bnfinit(x^21 - 103983*x^14 + 508304187*x^7 + 10460353203, 1)
 

Normalized defining polynomial

\( x^{21} - 103983 x^{14} + 508304187 x^{7} + 10460353203 \)

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

Invariants

Degree:  $21$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[3, 9]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(-996726852728145413540441359277571789889580380640583=-\,3^{18}\cdot 7^{29}\cdot 19^{14}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $268.23$
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:  $3, 7, 19$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $\frac{1}{12} a^{7} + \frac{1}{4}$, $\frac{1}{12} a^{8} + \frac{1}{4} a$, $\frac{1}{12} a^{9} + \frac{1}{4} a^{2}$, $\frac{1}{12} a^{10} + \frac{1}{4} a^{3}$, $\frac{1}{252} a^{11} - \frac{1}{28} a^{10} - \frac{1}{28} a^{9} + \frac{1}{84} a^{8} - \frac{1}{84} a^{7} + \frac{1}{84} a^{4} - \frac{3}{28} a^{3} - \frac{3}{28} a^{2} + \frac{1}{28} a - \frac{1}{28}$, $\frac{1}{252} a^{12} - \frac{1}{42} a^{10} + \frac{1}{42} a^{9} + \frac{1}{84} a^{8} - \frac{1}{42} a^{7} + \frac{1}{84} a^{5} - \frac{1}{14} a^{3} + \frac{1}{14} a^{2} + \frac{1}{28} a - \frac{1}{14}$, $\frac{1}{252} a^{13} - \frac{1}{42} a^{10} - \frac{1}{28} a^{9} - \frac{1}{28} a^{8} + \frac{1}{84} a^{7} + \frac{1}{84} a^{6} - \frac{1}{14} a^{3} - \frac{3}{28} a^{2} - \frac{3}{28} a + \frac{1}{28}$, $\frac{1}{30084387984} a^{14} - \frac{154238125}{5014064664} a^{7} + \frac{113445463}{1114236592}$, $\frac{1}{270759491856} a^{15} - \frac{572076847}{45126581976} a^{8} + \frac{949122907}{10028129328} a$, $\frac{1}{7310506280112} a^{16} + \frac{48315053627}{1218417713352} a^{9} - \frac{66740750057}{270759491856} a^{2}$, $\frac{1}{65794556521008} a^{17} - \frac{53219755819}{10965759420168} a^{10} + \frac{948607344403}{2436835426704} a^{3}$, $\frac{1}{1776453026067216} a^{18} - \frac{575398775827}{296075504344536} a^{11} - \frac{1}{84} a^{10} - \frac{1}{84} a^{9} - \frac{1}{42} a^{8} + \frac{1}{42} a^{7} + \frac{27405677691475}{65794556521008} a^{4} - \frac{1}{28} a^{3} - \frac{1}{28} a^{2} - \frac{1}{14} a + \frac{1}{14}$, $\frac{1}{15988077234604944} a^{19} + \frac{1774406814209}{2664679539100824} a^{12} + \frac{226355884314523}{592151008689072} a^{5}$, $\frac{1}{431678085334333488} a^{20} - \frac{8799718340953}{71946347555722248} a^{13} - \frac{1}{42} a^{10} - \frac{1}{28} a^{9} - \frac{1}{28} a^{8} + \frac{1}{84} a^{7} - \frac{3925750593279089}{15988077234604944} a^{6} - \frac{1}{14} a^{3} - \frac{3}{28} a^{2} - \frac{3}{28} a + \frac{1}{28}$

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

Class group and class number

$C_{21}$, which has order $21$ (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:  \( 48743028014176990 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

$C_3\times F_7$ (as 21T9):

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 126
The 21 conjugacy class representatives for $C_3\times F_7$
Character table for $C_3\times F_7$ is not computed

Intermediate fields

3.3.17689.1, Deg 7

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

Sibling fields

Degree 21 siblings: data not computed
Degree 42 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 ${\href{/LocalNumberField/2.3.0.1}{3} }^{7}$ R ${\href{/LocalNumberField/5.6.0.1}{6} }^{3}{,}\,{\href{/LocalNumberField/5.3.0.1}{3} }$ R $21$ ${\href{/LocalNumberField/13.6.0.1}{6} }^{3}{,}\,{\href{/LocalNumberField/13.3.0.1}{3} }$ ${\href{/LocalNumberField/17.6.0.1}{6} }^{3}{,}\,{\href{/LocalNumberField/17.1.0.1}{1} }^{3}$ R ${\href{/LocalNumberField/23.3.0.1}{3} }^{6}{,}\,{\href{/LocalNumberField/23.1.0.1}{1} }^{3}$ ${\href{/LocalNumberField/29.3.0.1}{3} }^{7}$ ${\href{/LocalNumberField/31.6.0.1}{6} }^{3}{,}\,{\href{/LocalNumberField/31.3.0.1}{3} }$ $21$ ${\href{/LocalNumberField/41.6.0.1}{6} }^{3}{,}\,{\href{/LocalNumberField/41.3.0.1}{3} }$ ${\href{/LocalNumberField/43.3.0.1}{3} }^{7}$ ${\href{/LocalNumberField/47.6.0.1}{6} }^{3}{,}\,{\href{/LocalNumberField/47.1.0.1}{1} }^{3}$ ${\href{/LocalNumberField/53.3.0.1}{3} }^{7}$ ${\href{/LocalNumberField/59.6.0.1}{6} }^{3}{,}\,{\href{/LocalNumberField/59.1.0.1}{1} }^{3}$

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
$3$3.7.6.1$x^{7} - 3$$7$$1$$6$$F_7$$[\ ]_{7}^{6}$
3.7.6.1$x^{7} - 3$$7$$1$$6$$F_7$$[\ ]_{7}^{6}$
3.7.6.1$x^{7} - 3$$7$$1$$6$$F_7$$[\ ]_{7}^{6}$
7Data not computed
19Data not computed