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Properties

Label 12.0.3493441689358336.15
Degree $12$
Signature $[0, 6]$
Discriminant $3.493\times 10^{15}$
Root discriminant \(19.74\)
Ramified primes $2,31$
Class number $4$
Class group [4]
Galois group $A_4$ (as 12T4)

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Normalized defining polynomial

Copy content comment:Define the number field
 
Copy content sage:x = polygen(QQ); K.<a> = NumberField(x^12 - 3*x^10 - 2*x^8 + 102*x^6 - 255*x^4 + 157*x^2 + 256)
 
Copy content gp:K = bnfinit(y^12 - 3*y^10 - 2*y^8 + 102*y^6 - 255*y^4 + 157*y^2 + 256, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^12 - 3*x^10 - 2*x^8 + 102*x^6 - 255*x^4 + 157*x^2 + 256);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^12 - 3*x^10 - 2*x^8 + 102*x^6 - 255*x^4 + 157*x^2 + 256)
 

\( x^{12} - 3x^{10} - 2x^{8} + 102x^{6} - 255x^{4} + 157x^{2} + 256 \) Copy content Toggle raw display

Copy content comment:Defining polynomial
 
Copy content sage:K.defining_polynomial()
 
Copy content gp:K.pol
 
Copy content magma:DefiningPolynomial(K);
 
Copy content oscar:defining_polynomial(K)
 

Invariants

Degree:  $12$
Copy content comment:Degree over Q
 
Copy content sage:K.degree()
 
Copy content gp:poldegree(K.pol)
 
Copy content magma:Degree(K);
 
Copy content oscar:degree(K)
 
Signature:  $[0, 6]$
Copy content comment:Signature
 
Copy content sage:K.signature()
 
Copy content gp:K.sign
 
Copy content magma:Signature(K);
 
Copy content oscar:signature(K)
 
Discriminant:   \(3493441689358336\) \(\medspace = 2^{12}\cdot 31^{8}\) Copy content Toggle raw display
Copy content comment:Discriminant
 
Copy content sage:K.disc()
 
Copy content gp:K.disc
 
Copy content magma:OK := Integers(K); Discriminant(OK);
 
Copy content oscar:OK = ring_of_integers(K); discriminant(OK)
 
Root discriminant:  \(19.74\)
Copy content sage:(K.disc().abs())^(1./K.degree())
 
Copy content gp:abs(K.disc)^(1/poldegree(K.pol))
 
Copy content magma:Abs(Discriminant(OK))^(1/Degree(K));
 
Copy content oscar:(1.0 * dK)^(1/degree(K))
 
Galois root discriminant:  $2\cdot 31^{2/3}\approx 19.736544806437948$
Ramified primes:   \(2\), \(31\) Copy content Toggle raw display
Copy content comment:Ramified primes
 
Copy content sage:K.disc().support()
 
Copy content gp:factor(abs(K.disc))[,1]~
 
Copy content magma:PrimeDivisors(Discriminant(OK));
 
Copy content oscar:prime_divisors(discriminant((OK)))
 
Discriminant root field:  \(\Q\)
$\Aut(K/\Q)$ $=$ $\Gal(K/\Q)$:   $A_4$
Copy content comment:Autmorphisms
 
Copy content sage:K.automorphisms()
 
Copy content magma:Automorphisms(K);
 
Copy content oscar:automorphisms(K)
 
This field is Galois over $\Q$.
This is not a CM field.
This field has no CM subfields.

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

$1$, $a$, $a^{2}$, $\frac{1}{2}a^{3}-\frac{1}{2}a$, $\frac{1}{4}a^{4}-\frac{1}{4}a^{3}+\frac{1}{4}a^{2}-\frac{1}{4}a$, $\frac{1}{8}a^{5}-\frac{1}{8}a$, $\frac{1}{16}a^{6}-\frac{1}{16}a^{5}+\frac{7}{16}a^{2}-\frac{7}{16}a$, $\frac{1}{16}a^{7}-\frac{1}{16}a^{5}-\frac{1}{16}a^{3}+\frac{1}{16}a$, $\frac{1}{16}a^{8}-\frac{1}{16}a^{5}-\frac{1}{16}a^{4}-\frac{1}{2}a^{2}-\frac{7}{16}a$, $\frac{1}{32}a^{9}-\frac{1}{32}a^{8}-\frac{1}{32}a^{7}-\frac{1}{32}a^{6}+\frac{1}{32}a^{5}+\frac{1}{32}a^{4}+\frac{1}{32}a^{3}+\frac{1}{32}a^{2}-\frac{1}{16}a$, $\frac{1}{3968}a^{10}+\frac{1}{124}a^{8}-\frac{61}{1984}a^{6}-\frac{1}{16}a^{5}-\frac{7}{62}a^{4}-\frac{807}{3968}a^{2}-\frac{7}{16}a+\frac{15}{31}$, $\frac{1}{7936}a^{11}-\frac{1}{7936}a^{10}+\frac{1}{248}a^{9}+\frac{27}{992}a^{8}+\frac{63}{3968}a^{7}+\frac{61}{3968}a^{6}+\frac{3}{496}a^{5}+\frac{25}{992}a^{4}-\frac{1055}{7936}a^{3}+\frac{2791}{7936}a^{2}+\frac{213}{496}a+\frac{8}{31}$ Copy content Toggle raw display

Copy content comment:Integral basis
 
Copy content sage:K.integral_basis()
 
Copy content gp:K.zk
 
Copy content magma:IntegralBasis(K);
 
Copy content oscar:basis(OK)
 

Monogenic:  No
Index:  Not computed
Inessential primes:  $2$

Class group and class number

Ideal class group:  $C_{4}$, which has order $4$
Copy content comment:Class group
 
Copy content sage:K.class_group().invariants()
 
Copy content gp:K.clgp
 
Copy content magma:ClassGroup(K);
 
Copy content oscar:class_group(K)
 
Narrow class group:  $C_{4}$, which has order $4$
Copy content comment:Narrow class group
 
Copy content sage:K.narrow_class_group().invariants()
 
Copy content gp:bnfnarrow(K)
 
Copy content magma:NarrowClassGroup(K);
 

Unit group

Copy content comment:Unit group
 
Copy content sage:UK = K.unit_group()
 
Copy content magma:UK, fUK := UnitGroup(K);
 
Copy content oscar:UK, fUK = unit_group(OK)
 
Rank:  $5$
Copy content comment:Unit rank
 
Copy content sage:UK.rank()
 
Copy content gp:K.fu
 
Copy content magma:UnitRank(K);
 
Copy content oscar:rank(UK)
 
Torsion generator:   \( -1 \)  (order $2$) Copy content Toggle raw display
Copy content comment:Generator for roots of unity
 
Copy content sage:UK.torsion_generator()
 
Copy content gp:K.tu[2]
 
Copy content magma:K!f(TU.1) where TU,f is TorsionUnitGroup(K);
 
Copy content oscar:torsion_units_generator(OK)
 
Fundamental units:   $\frac{15}{1984}a^{11}-\frac{29}{3968}a^{10}-\frac{1}{124}a^{9}+\frac{1}{62}a^{8}-\frac{47}{992}a^{7}+\frac{33}{1984}a^{6}+\frac{335}{496}a^{5}-\frac{45}{62}a^{4}-\frac{1441}{1984}a^{3}+\frac{4059}{3968}a^{2}-\frac{271}{496}a+\frac{30}{31}$, $\frac{5}{992}a^{11}-\frac{29}{3968}a^{10}-\frac{13}{496}a^{9}+\frac{1}{62}a^{8}+\frac{5}{496}a^{7}+\frac{33}{1984}a^{6}+\frac{275}{496}a^{5}-\frac{45}{62}a^{4}-\frac{2423}{992}a^{3}+\frac{4059}{3968}a^{2}+\frac{447}{248}a-\frac{63}{31}$, $\frac{43}{3968}a^{11}-\frac{19}{1984}a^{10}-\frac{7}{248}a^{9}+\frac{3}{496}a^{8}-\frac{19}{1984}a^{7}+\frac{43}{992}a^{6}+\frac{537}{496}a^{5}-\frac{383}{496}a^{4}-\frac{9157}{3968}a^{3}+\frac{1197}{1984}a^{2}+\frac{1485}{496}a-\frac{12}{31}$, $\frac{1}{496}a^{11}+\frac{1}{496}a^{9}+\frac{1}{248}a^{7}+\frac{55}{248}a^{5}+\frac{61}{496}a^{3}-\frac{95}{496}a$, $\frac{11}{1984}a^{11}-\frac{5}{496}a^{9}-\frac{51}{992}a^{7}+\frac{16}{31}a^{5}-\frac{1189}{1984}a^{3}-\frac{1323}{496}a$ Copy content Toggle raw display
Copy content comment:Fundamental units
 
Copy content sage:UK.fundamental_units()
 
Copy content gp:K.fu
 
Copy content magma:[K|fUK(g): g in Generators(UK)];
 
Copy content oscar:[K(fUK(a)) for a in gens(UK)]
 
Regulator:  \( 4903.16351074 \)
Copy content comment:Regulator
 
Copy content sage:K.regulator()
 
Copy content gp:K.reg
 
Copy content magma:Regulator(K);
 
Copy content oscar:regulator(K)
 

Class number formula

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{6}\cdot 4903.16351074 \cdot 4}{2\cdot\sqrt{3493441689358336}}\cr\approx \mathstrut & 10.2084271252 \end{aligned}\]

Copy content comment:Analytic class number formula
 
Copy content sage:# self-contained SageMath code snippet to compute the analytic class number formula x = polygen(QQ); K.<a> = NumberField(x^12 - 3*x^10 - 2*x^8 + 102*x^6 - 255*x^4 + 157*x^2 + 256) DK = K.disc(); r1,r2 = K.signature(); RK = K.regulator(); RR = RK.parent() hK = K.class_number(); wK = K.unit_group().torsion_generator().order(); 2^r1 * (2*RR(pi))^r2 * RK * hK / (wK * RR(sqrt(abs(DK))))
 
Copy content gp:\\ self-contained Pari/GP code snippet to compute the analytic class number formula K = bnfinit(x^12 - 3*x^10 - 2*x^8 + 102*x^6 - 255*x^4 + 157*x^2 + 256, 1); [polcoeff (lfunrootres (lfuncreate (K))[1][1][2], -1), 2^K.r1 * (2*Pi)^K.r2 * K.reg * K.no / (K.tu[1] * sqrt (abs (K.disc)))]
 
Copy content magma:/* self-contained Magma code snippet to compute the analytic class number formula */ Qx<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^12 - 3*x^10 - 2*x^8 + 102*x^6 - 255*x^4 + 157*x^2 + 256); OK := Integers(K); DK := Discriminant(OK); UK, fUK := UnitGroup(OK); clK, fclK := ClassGroup(OK); r1,r2 := Signature(K); RK := Regulator(K); RR := Parent(RK); hK := #clK; wK := #TorsionSubgroup(UK); 2^r1 * (2*Pi(RR))^r2 * RK * hK / (wK * Sqrt(RR!Abs(DK)));
 
Copy content oscar:# self-contained Oscar code snippet to compute the analytic class number formula Qx, x = PolynomialRing(QQ); K, a = NumberField(x^12 - 3*x^10 - 2*x^8 + 102*x^6 - 255*x^4 + 157*x^2 + 256); OK = ring_of_integers(K); DK = discriminant(OK); UK, fUK = unit_group(OK); clK, fclK = class_group(OK); r1,r2 = signature(K); RK = regulator(K); RR = parent(RK); hK = order(clK); wK = torsion_units_order(K); 2^r1 * (2*pi)^r2 * RK * hK / (wK * sqrt(RR(abs(DK))))
 

Galois group

$A_4$ (as 12T4):

Copy content comment:Galois group
 
Copy content sage:K.galois_group(type='pari')
 
Copy content gp:polgalois(K.pol)
 
Copy content magma:G = GaloisGroup(K);
 
Copy content oscar:G, Gtx = galois_group(K); G, transitive_group_identification(G)
 
A solvable group of order 12
The 4 conjugacy class representatives for $A_4$
Character table for $A_4$

Intermediate fields

3.3.961.1, 4.0.15376.1 x4, 6.2.14776336.1 x3

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

Copy content comment:Intermediate fields
 
Copy content sage:K.subfields()[1:-1]
 
Copy content gp:L = nfsubfields(K); L[2..length(b)]
 
Copy content magma:L := Subfields(K); L[2..#L];
 
Copy content oscar:subfields(K)[2:end-1]
 

Sibling fields

Degree 4 sibling: 4.0.15376.1
Degree 6 sibling: 6.2.14776336.1
Minimal sibling: 4.0.15376.1

Frobenius cycle types

$p$ $2$ $3$ $5$ $7$ $11$ $13$ $17$ $19$ $23$ $29$ $31$ $37$ $41$ $43$ $47$ $53$ $59$
Cycle type R ${\href{/padicField/3.3.0.1}{3} }^{4}$ ${\href{/padicField/5.3.0.1}{3} }^{4}$ ${\href{/padicField/7.3.0.1}{3} }^{4}$ ${\href{/padicField/11.3.0.1}{3} }^{4}$ ${\href{/padicField/13.3.0.1}{3} }^{4}$ ${\href{/padicField/17.3.0.1}{3} }^{4}$ ${\href{/padicField/19.3.0.1}{3} }^{4}$ ${\href{/padicField/23.2.0.1}{2} }^{6}$ ${\href{/padicField/29.2.0.1}{2} }^{6}$ R ${\href{/padicField/37.3.0.1}{3} }^{4}$ ${\href{/padicField/41.3.0.1}{3} }^{4}$ ${\href{/padicField/43.3.0.1}{3} }^{4}$ ${\href{/padicField/47.2.0.1}{2} }^{6}$ ${\href{/padicField/53.3.0.1}{3} }^{4}$ ${\href{/padicField/59.3.0.1}{3} }^{4}$

In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.

Copy content comment:Frobenius cycle types
 
Copy content sage:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Sage: p = 7; [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
 
Copy content gp:\\ to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Pari: p = 7; pfac = idealprimedec(K, p); vector(length(pfac), j, [pfac[j][3], pfac[j][4]])
 
Copy content magma:// to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Magma: p := 7; [<pr[2], Valuation(Norm(pr[1]), p)> : pr in Factorization(p*Integers(K))];
 
Copy content oscar:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Oscar: p = 7; pfac = factor(ideal(ring_of_integers(K), p)); [(e, valuation(norm(pr),p)) for (pr,e) in pfac]
 

Local algebras for ramified primes

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
\(2\) Copy content Toggle raw display 2.1.2.2a1.2$x^{2} + 2 x + 6$$2$$1$$2$$C_2$$$[2]$$
2.1.2.2a1.2$x^{2} + 2 x + 6$$2$$1$$2$$C_2$$$[2]$$
2.1.2.2a1.2$x^{2} + 2 x + 6$$2$$1$$2$$C_2$$$[2]$$
2.1.2.2a1.2$x^{2} + 2 x + 6$$2$$1$$2$$C_2$$$[2]$$
2.1.2.2a1.2$x^{2} + 2 x + 6$$2$$1$$2$$C_2$$$[2]$$
2.1.2.2a1.2$x^{2} + 2 x + 6$$2$$1$$2$$C_2$$$[2]$$
\(31\) Copy content Toggle raw display 31.1.3.2a1.1$x^{3} + 31$$3$$1$$2$$C_3$$$[\ ]_{3}$$
31.1.3.2a1.1$x^{3} + 31$$3$$1$$2$$C_3$$$[\ ]_{3}$$
31.1.3.2a1.1$x^{3} + 31$$3$$1$$2$$C_3$$$[\ ]_{3}$$
31.1.3.2a1.1$x^{3} + 31$$3$$1$$2$$C_3$$$[\ ]_{3}$$

Spectrum of ring of integers

(0)(0)(2)(3)(5)(7)(11)(13)(17)(19)(23)(29)(31)(37)(41)(43)(47)(53)(59)