↑

Properties

Label 8.0.151026994011...5833.2
Degree $8$
Signature $[0, 4]$
Discriminant $137^{7}\cdot 401^{7}$
Root discriminant $14{,}040.48$
Ramified primes $137, 401$
Class number $1031972968$ (GRH)
Class group $[1031972968]$ (GRH)
Galois group $C_8$ (as 8T1)

Related objects

Downloads

Learn more about

Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![188675512537088, -15966068329056, 291843263844, 4853572775, -46189007, 466106, 3434, -1, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^8 - x^7 + 3434*x^6 + 466106*x^5 - 46189007*x^4 + 4853572775*x^3 + 291843263844*x^2 - 15966068329056*x + 188675512537088)
 
gp: K = bnfinit(x^8 - x^7 + 3434*x^6 + 466106*x^5 - 46189007*x^4 + 4853572775*x^3 + 291843263844*x^2 - 15966068329056*x + 188675512537088, 1)
 

Normalized defining polynomial

\( x^{8} - x^{7} + 3434 x^{6} + 466106 x^{5} - 46189007 x^{4} + 4853572775 x^{3} + 291843263844 x^{2} - 15966068329056 x + 188675512537088 \)

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

Invariants

Degree:  $8$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[0, 4]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(1510269940117393787434340294825833=137^{7}\cdot 401^{7}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $14{,}040.48$
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:  $137, 401$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is Galois and abelian over $\Q$.
Conductor:  \(54937=137\cdot 401\)
Dirichlet character group:    not computed
This is a CM field.

Integral basis (with respect to field generator \(a\))

$1$, $a$, $\frac{1}{2} a^{2} - \frac{1}{2} a$, $\frac{1}{4} a^{3} - \frac{1}{4} a$, $\frac{1}{72} a^{4} + \frac{1}{18} a^{3} + \frac{7}{72} a^{2} + \frac{5}{18} a - \frac{1}{9}$, $\frac{1}{4752} a^{5} + \frac{1}{528} a^{4} + \frac{17}{176} a^{3} + \frac{271}{4752} a^{2} - \frac{11}{108} a - \frac{115}{297}$, $\frac{1}{85536} a^{6} + \frac{1}{21384} a^{5} - \frac{19}{14256} a^{4} - \frac{5}{243} a^{3} + \frac{75}{352} a^{2} + \frac{8791}{21384} a - \frac{26}{2673}$, $\frac{1}{764276271197559717482531712} a^{7} - \frac{28969538078569777055}{5789971751496664526382816} a^{6} + \frac{27513051045841182292255}{382138135598779858741265856} a^{5} + \frac{136483732650145725079913}{23883633474923741171329116} a^{4} + \frac{22950815160397385621293793}{764276271197559717482531712} a^{3} - \frac{8469161268257666994779225}{191069067799389929370632928} a^{2} + \frac{3808947918324106452182261}{23883633474923741171329116} a + \frac{2732529387438021855710183}{5970908368730935292832279}$

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

Class group and class number

$C_{1031972968}$, which has order $1031972968$ (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:  $3$
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:  \( 7488559.87237 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

$C_8$ (as 8T1):

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A cyclic group of order 8
The 8 conjugacy class representatives for $C_8$
Character table for $C_8$

Intermediate fields

\(\Q(\sqrt{54937}) \), 4.4.165803929634953.1

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

Frobenius cycle types

$p$ 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59
Cycle type ${\href{/LocalNumberField/2.1.0.1}{1} }^{8}$ ${\href{/LocalNumberField/3.2.0.1}{2} }^{4}$ ${\href{/LocalNumberField/5.8.0.1}{8} }$ ${\href{/LocalNumberField/7.2.0.1}{2} }^{4}$ ${\href{/LocalNumberField/11.1.0.1}{1} }^{8}$ ${\href{/LocalNumberField/13.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/17.8.0.1}{8} }$ ${\href{/LocalNumberField/19.8.0.1}{8} }$ ${\href{/LocalNumberField/23.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/29.8.0.1}{8} }$ ${\href{/LocalNumberField/31.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/37.8.0.1}{8} }$ ${\href{/LocalNumberField/41.8.0.1}{8} }$ ${\href{/LocalNumberField/43.8.0.1}{8} }$ ${\href{/LocalNumberField/47.8.0.1}{8} }$ ${\href{/LocalNumberField/53.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/59.8.0.1}{8} }$

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
$137$137.8.7.6$x^{8} + 3699$$8$$1$$7$$C_8$$[\ ]_{8}$
401Data not computed