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Properties

Label 8.0.545342477656...2201.4
Degree $8$
Signature $[0, 4]$
Discriminant $73^{7}\cdot 337^{7}$
Root discriminant $6951.58$
Ramified primes $73, 337$
Class number $2785668392$ (GRH)
Class group $[2785668392]$ (GRH)
Galois group $C_8$ (as 8T1)

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![28504814036976, -1163044889868, 28692271888, 373377251, -6548803, 356330, 1538, -1, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^8 - x^7 + 1538*x^6 + 356330*x^5 - 6548803*x^4 + 373377251*x^3 + 28692271888*x^2 - 1163044889868*x + 28504814036976)
 
gp: K = bnfinit(x^8 - x^7 + 1538*x^6 + 356330*x^5 - 6548803*x^4 + 373377251*x^3 + 28692271888*x^2 - 1163044889868*x + 28504814036976, 1)
 

Normalized defining polynomial

\( x^{8} - x^{7} + 1538 x^{6} + 356330 x^{5} - 6548803 x^{4} + 373377251 x^{3} + 28692271888 x^{2} - 1163044889868 x + 28504814036976 \)

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:  \(5453424776560798429911468532201=73^{7}\cdot 337^{7}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $6951.58$
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:  $73, 337$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is Galois and abelian over $\Q$.
Conductor:  \(24601=73\cdot 337\)
Dirichlet character group:    not computed
This is a CM field.

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

$1$, $a$, $\frac{1}{2} a^{2} - \frac{1}{2} a$, $\frac{1}{6} a^{3} - \frac{1}{6} a$, $\frac{1}{72} a^{4} - \frac{1}{36} a^{3} - \frac{13}{72} a^{2} + \frac{7}{36} a + \frac{1}{3}$, $\frac{1}{432} a^{5} - \frac{5}{432} a^{3} + \frac{1}{18} a^{2} - \frac{17}{108} a + \frac{1}{9}$, $\frac{1}{6912} a^{6} - \frac{1}{2304} a^{5} + \frac{7}{6912} a^{4} - \frac{139}{2304} a^{3} - \frac{145}{864} a^{2} + \frac{215}{576} a + \frac{7}{48}$, $\frac{1}{757067747084547705667584} a^{7} - \frac{9716714653083566281}{378533873542273852833792} a^{6} - \frac{69700968976601463059}{189266936771136926416896} a^{5} + \frac{945845352935035860347}{378533873542273852833792} a^{4} - \frac{19528760208302717622425}{757067747084547705667584} a^{3} - \frac{62097104647072578709}{4616266750515534790656} a^{2} + \frac{10029291762915448509947}{63088978923712308805632} a + \frac{2079340980837410283607}{5257414910309359067136}$

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

Class group and class number

$C_{2785668392}$, which has order $2785668392$ (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:  \( 1495556.51062 \) (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

\(\Q(\sqrt{24601}) \), 4.4.14888751553801.1

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 ${\href{/LocalNumberField/2.1.0.1}{1} }^{8}$ ${\href{/LocalNumberField/3.1.0.1}{1} }^{8}$ ${\href{/LocalNumberField/5.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/7.8.0.1}{8} }$ ${\href{/LocalNumberField/11.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/13.8.0.1}{8} }$ ${\href{/LocalNumberField/17.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/19.8.0.1}{8} }$ ${\href{/LocalNumberField/23.8.0.1}{8} }$ ${\href{/LocalNumberField/29.1.0.1}{1} }^{8}$ ${\href{/LocalNumberField/31.2.0.1}{2} }^{4}$ ${\href{/LocalNumberField/37.2.0.1}{2} }^{4}$ ${\href{/LocalNumberField/41.1.0.1}{1} }^{8}$ ${\href{/LocalNumberField/43.8.0.1}{8} }$ ${\href{/LocalNumberField/47.8.0.1}{8} }$ ${\href{/LocalNumberField/53.2.0.1}{2} }^{4}$ ${\href{/LocalNumberField/59.1.0.1}{1} }^{8}$

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
$73$73.8.7.5$x^{8} + 365$$8$$1$$7$$C_8$$[\ ]_{8}$
337Data not computed