Normalized defining polynomial
sage: x = polygen(QQ); K.<a> = NumberField(x^12 - 12*x^10 + 18*x^8 + 94*x^6 + 45*x^4 - 18*x^2 - 1)
gp: K = bnfinit(y^12 - 12*y^10 + 18*y^8 + 94*y^6 + 45*y^4 - 18*y^2 - 1, 1)
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^12 - 12*x^10 + 18*x^8 + 94*x^6 + 45*x^4 - 18*x^2 - 1);
oscar: Qx, x = PolynomialRing(QQ); K, a = NumberField(x^12 - 12*x^10 + 18*x^8 + 94*x^6 + 45*x^4 - 18*x^2 - 1)
\( x^{12} - 12x^{10} + 18x^{8} + 94x^{6} + 45x^{4} - 18x^{2} - 1 \)
sage: K.defining_polynomial()
gp: K.pol
magma: DefiningPolynomial(K);
oscar: defining_polynomial(K)
Invariants
| Degree: | $12$ | sage: K.degree()
gp: poldegree(K.pol)
magma: Degree(K);
oscar: degree(K)
| |
| Signature: | $[6, 3]$ | sage: K.signature()
gp: K.sign
magma: Signature(K);
oscar: signature(K)
| |
| Discriminant: |
\(-46221064723759104\)
\(\medspace = -\,2^{30}\cdot 3^{16}\)
| sage: K.disc()
gp: K.disc
magma: OK := Integers(K); Discriminant(OK);
oscar: OK = ring_of_integers(K); discriminant(OK)
| |
| Root discriminant: | \(24.48\) | sage: (K.disc().abs())^(1./K.degree())
gp: abs(K.disc)^(1/poldegree(K.pol))
magma: Abs(Discriminant(OK))^(1/Degree(K));
oscar: (1.0 * dK)^(1/degree(K))
| |
| Galois root discriminant: | $2^{11/4}3^{4/3}\approx 29.106779845745038$ | ||
| Ramified primes: |
\(2\), \(3\)
| sage: K.disc().support()
gp: factor(abs(K.disc))[,1]~
magma: PrimeDivisors(Discriminant(OK));
oscar: prime_divisors(discriminant((OK)))
| |
| Discriminant root field: | \(\Q(\sqrt{-1}) \) | ||
| $\card{ \Aut(K/\Q) }$: | $6$ | sage: K.automorphisms()
magma: Automorphisms(K);
oscar: automorphisms(K)
| |
| This field is not Galois over $\Q$. | |||
| This is not a CM field. | |||
Integral basis (with respect to field generator \(a\))
$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $\frac{1}{7361}a^{10}-\frac{512}{7361}a^{8}-\frac{1617}{7361}a^{6}-\frac{1116}{7361}a^{4}-\frac{1391}{7361}a^{2}+\frac{3548}{7361}$, $\frac{1}{7361}a^{11}-\frac{512}{7361}a^{9}-\frac{1617}{7361}a^{7}-\frac{1116}{7361}a^{5}-\frac{1391}{7361}a^{3}+\frac{3548}{7361}a$
sage: K.integral_basis()
gp: K.zk
magma: IntegralBasis(K);
oscar: basis(OK)
| Monogenic: | Not computed | |
| Index: | $1$ | |
| Inessential primes: | None |
Class group and class number
Trivial group, which has order $1$
sage: K.class_group().invariants()
gp: K.clgp
magma: ClassGroup(K);
oscar: class_group(K)
Unit group
sage: UK = K.unit_group()
magma: UK, fUK := UnitGroup(K);
oscar: UK, fUK = unit_group(OK)
| Rank: | $8$ | sage: UK.rank()
gp: K.fu
magma: UnitRank(K);
oscar: rank(UK)
| |
| Torsion generator: |
\( -1 \)
(order $2$)
| sage: UK.torsion_generator()
gp: K.tu[2]
magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K);
oscar: torsion_units_generator(OK)
| |
| Fundamental units: |
$\frac{2178}{7361}a^{11}-\frac{25708}{7361}a^{9}+\frac{33537}{7361}a^{7}+\frac{219312}{7361}a^{5}+\frac{120910}{7361}a^{3}-\frac{45672}{7361}a$, $\frac{590}{7361}a^{10}-\frac{7640}{7361}a^{8}+\frac{17622}{7361}a^{6}+\frac{40855}{7361}a^{4}-\frac{10980}{7361}a^{2}-\frac{11926}{7361}$, $\frac{162}{7361}a^{10}-\frac{1973}{7361}a^{8}+\frac{3042}{7361}a^{6}+\frac{17955}{7361}a^{4}-\frac{4512}{7361}a^{2}-\frac{14104}{7361}$, $\frac{808}{7361}a^{11}-\frac{8841}{7361}a^{9}+\frac{3722}{7361}a^{7}+\frac{99368}{7361}a^{5}+\frac{90637}{7361}a^{3}+\frac{10716}{7361}a$, $\frac{1722}{7361}a^{11}-\frac{20427}{7361}a^{9}+\frac{27428}{7361}a^{7}+\frac{176133}{7361}a^{5}+\frac{70633}{7361}a^{3}-\frac{51501}{7361}a$, $\frac{2016}{7361}a^{11}-\frac{618}{7361}a^{10}-\frac{23735}{7361}a^{9}+\frac{7254}{7361}a^{8}+\frac{30495}{7361}a^{7}-\frac{9151}{7361}a^{6}+\frac{201357}{7361}a^{5}-\frac{61134}{7361}a^{4}+\frac{125422}{7361}a^{3}-\frac{45765}{7361}a^{2}-\frac{24207}{7361}a+\frac{914}{7361}$, $\frac{1264}{7361}a^{11}-\frac{808}{7361}a^{10}-\frac{14122}{7361}a^{9}+\frac{8841}{7361}a^{8}+\frac{9831}{7361}a^{7}-\frac{3722}{7361}a^{6}+\frac{142547}{7361}a^{5}-\frac{99368}{7361}a^{4}+\frac{140914}{7361}a^{3}-\frac{90637}{7361}a^{2}+\frac{16545}{7361}a-\frac{3355}{7361}$, $\frac{2016}{7361}a^{11}+\frac{33}{433}a^{10}-\frac{23735}{7361}a^{9}-\frac{442}{433}a^{8}+\frac{30495}{7361}a^{7}+\frac{1197}{433}a^{6}+\frac{201357}{7361}a^{5}+\frac{1709}{433}a^{4}+\frac{125422}{7361}a^{3}-\frac{1737}{433}a^{2}-\frac{31568}{7361}a-\frac{259}{433}$
| sage: UK.fundamental_units()
gp: K.fu
magma: [K|fUK(g): g in Generators(UK)];
oscar: [K(fUK(a)) for a in gens(UK)]
| |
| Regulator: | \( 3758.13879609 \) | sage: K.regulator()
gp: K.reg
magma: Regulator(K);
oscar: regulator(K)
|
Class number formula
\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{6}\cdot(2\pi)^{3}\cdot 3758.13879609 \cdot 1}{2\cdot\sqrt{46221064723759104}}\cr\approx \mathstrut & 0.138753014159 \end{aligned}\]
# self-contained SageMath code snippet to compute the analytic class number formula
x = polygen(QQ); K.<a> = NumberField(x^12 - 12*x^10 + 18*x^8 + 94*x^6 + 45*x^4 - 18*x^2 - 1)
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))))
# self-contained Pari/GP code snippet to compute the analytic class number formula
K = bnfinit(x^12 - 12*x^10 + 18*x^8 + 94*x^6 + 45*x^4 - 18*x^2 - 1, 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)))]
/* self-contained Magma code snippet to compute the analytic class number formula */
Qx<x> := PolynomialRing(QQ); K<a> := NumberField(x^12 - 12*x^10 + 18*x^8 + 94*x^6 + 45*x^4 - 18*x^2 - 1);
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)));
# self-contained Oscar code snippet to compute the analytic class number formula
Qx, x = PolynomialRing(QQ); K, a = NumberField(x^12 - 12*x^10 + 18*x^8 + 94*x^6 + 45*x^4 - 18*x^2 - 1);
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
$C_3\times D_4$ (as 12T14):
sage: K.galois_group(type='pari')
gp: polgalois(K.pol)
magma: G = GaloisGroup(K);
oscar: G, Gtx = galois_group(K); G, transitive_group_identification(G)
| A solvable group of order 24 |
| The 15 conjugacy class representatives for $D_4 \times C_3$ |
| Character table for $D_4 \times C_3$ |
Intermediate fields
| \(\Q(\sqrt{2}) \), \(\Q(\zeta_{9})^+\), 4.2.1024.1, 6.6.3359232.1 |
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
sage: K.subfields()[1:-1]
gp: L = nfsubfields(K); L[2..length(b)]
magma: L := Subfields(K); L[2..#L];
oscar: subfields(K)[2:end-1]
Sibling fields
| Galois closure: | deg 24 |
| Degree 12 sibling: | 12.0.5777633090469888.6 |
| Minimal sibling: | 12.0.5777633090469888.6 |
Frobenius cycle types
| $p$ | $2$ | $3$ | $5$ | $7$ | $11$ | $13$ | $17$ | $19$ | $23$ | $29$ | $31$ | $37$ | $41$ | $43$ | $47$ | $53$ | $59$ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cycle type | R | R | ${\href{/padicField/5.6.0.1}{6} }^{2}$ | ${\href{/padicField/7.6.0.1}{6} }{,}\,{\href{/padicField/7.3.0.1}{3} }^{2}$ | ${\href{/padicField/11.12.0.1}{12} }$ | ${\href{/padicField/13.6.0.1}{6} }^{2}$ | ${\href{/padicField/17.2.0.1}{2} }^{6}$ | ${\href{/padicField/19.4.0.1}{4} }^{3}$ | ${\href{/padicField/23.6.0.1}{6} }{,}\,{\href{/padicField/23.3.0.1}{3} }^{2}$ | ${\href{/padicField/29.6.0.1}{6} }^{2}$ | ${\href{/padicField/31.6.0.1}{6} }{,}\,{\href{/padicField/31.3.0.1}{3} }^{2}$ | ${\href{/padicField/37.2.0.1}{2} }^{6}$ | ${\href{/padicField/41.3.0.1}{3} }^{4}$ | ${\href{/padicField/43.12.0.1}{12} }$ | ${\href{/padicField/47.6.0.1}{6} }{,}\,{\href{/padicField/47.3.0.1}{3} }^{2}$ | ${\href{/padicField/53.2.0.1}{2} }^{6}$ | ${\href{/padicField/59.12.0.1}{12} }$ |
In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.
# to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$ for $p=7$ in Sage:
p = 7; [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
\\ to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$ for $p=7$ in Pari:
p = 7; pfac = idealprimedec(K, p); vector(length(pfac), j, [pfac[j][3], pfac[j][4]])
// to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$ for $p=7 in Magma:
p := 7; [<pr[2], Valuation(Norm(pr[1]), p)> : pr in Factorization(p*Integers(K))];
# to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$ 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
| $p$ | Label | Polynomial | $e$ | $f$ | $c$ | Galois group | Slope content |
|---|---|---|---|---|---|---|---|
|
\(2\)
| 2.12.30.176 | $x^{12} + 12 x^{11} + 60 x^{10} + 184 x^{9} + 754 x^{8} + 2128 x^{7} + 6496 x^{6} + 7712 x^{5} + 17276 x^{4} + 10736 x^{3} + 18000 x^{2} + 5088 x + 6392$ | $4$ | $3$ | $30$ | $D_4 \times C_3$ | $[2, 3, 7/2]^{3}$ |
|
\(3\)
| 3.12.16.14 | $x^{12} + 24 x^{11} + 216 x^{10} + 768 x^{9} - 432 x^{8} - 10368 x^{7} - 18414 x^{6} + 27864 x^{5} + 83592 x^{4} + 10800 x^{3} + 64800 x^{2} + 901125$ | $3$ | $4$ | $16$ | $C_{12}$ | $[2]^{4}$ |